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Vladimir

@vladang

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5.0
366

7.7

7.7

98%

Turning Ideas Into Scalable Digital Products

$40 USD / Hour

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Flag of SERBIA

Serbia (10:47 PM)

・

Joined on January 31, 2010

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18 Recommendations

$40 USD / Hour

・

I’m a Senior Software Engineer with 10+ years of experience building secure, scalable, and high-performance web, mobile, and AI-powered applications that solve real business problems and drive measurable results. I specialize in end-to-end development — from planning and architecture to deployment, optimization, and long-term support. Whether you need a modern website, SaaS platform, mobile app, AI-powered solution, eCommerce store, custom CMS, API integration, automation workflow, or enterprise application, I deliver reliable, scalable, and future-ready solutions tailored to your goals. My expertise includes: • Frontend: React.js, Next.js, Vue.js, Nuxt.js, Angular, TypeScript, JavaScript, Tailwind CSS, shadcn/ui, responsive UI/UX, performance optimization. • Backend: Node.js (Express, NestJS), Python (Django, Flask, FastAPI), PHP (Laravel), C# (.NET), REST APIs, GraphQL, microservices, authentication, real-time systems. • Mobile: React Native, Flutter, Native Android (Java/Kotlin). • WordPress & CMS: WordPress, WooCommerce, Elementor, Gutenberg, ACF, custom themes/plugins, Sanity, Strapi, Contentful, Payload CMS, Directus, Storyblok, [login to view URL], and headless CMS architectures. • Shopify & eCommerce: Shopify, Shopify Plus, Liquid, Hydrogen/Oxygen, custom apps, WooCommerce, Stripe, PayPal, subscriptions, and conversion-focused stores. • AI & Automation: OpenAI GPT, Claude, LangChain, Llama, RAG, AI chatbots, intelligent workflows, automation, and custom AI solutions. • Cloud & DevOps: PostgreSQL, MySQL, MongoDB, Firebase, Supabase, Docker, CI/CD, AWS, Azure, GCP, Vercel, and scalable cloud infrastructure. I focus on building clean, maintainable, and business-focused solutions with strong communication, reliable delivery, and attention to detail. From startups and MVPs to enterprise systems and long-term product development, I help turn ideas into scalable, high-quality products. If you’re looking for an experienced expert who can handle everything from modern web platforms and mobile apps to AI integrations, WordPress, Shopify, CMS development, and complex custom solutions — let’s build something exceptional.

Verifications

On time

96%

On budget

94%

Accept rate

91%

Repeat hire rate

23%

Freelancer Java Developers Serbia
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Portfolio

Portfolio

14014297
Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

13990277
https://rapp-stock.vercel.app Rapp Stock is a live, stock-market-style web app where music artists are traded like assets — their "share price" driven by real streaming data instead of random numbers. I designed and built the full pipeline end-to-end: a scheduled ingest pulls live listening data from the Last.fm API, stores it as immutable, timestamped snapshots, and feeds a deterministic pricing engine that moves each artist's price based on how their growth compares to their own recent trend. Every price move is fully explainable — each artist page has a "Why'd it move?" breakdown showing the exact stored numbers behind the change, so nothing is a black box. Highlights: • Custom pricing engine (pure, fully unit-tested) that reacts to growth surprise, with a daily circuit-breaker and tunable sensitivity/smoothing knobs • Live admin panel to adjust the pricing formula in real time, with a validated audit log of every change • Polished, accessible dark "finte

A Stock Market for Music Artists

https://rapp-stock.vercel.app Rapp Stock is a live, stock-market-style web app where music artists are traded like assets — their "share price" driven by real streaming data instead of random numbers. I designed and built the full pipeline end-to-end: a scheduled ingest pulls live listening data from the Last.fm API, stores it as immutable, timestamped snapshots, and feeds a deterministic pricing engine that moves each artist's price based on how their growth compares to their own recent trend. Every price move is fully explainable — each artist page has a "Why'd it move?" breakdown showing the exact stored numbers behind the change, so nothing is a black box. Highlights: • Custom pricing engine (pure, fully unit-tested) that reacts to growth surprise, with a daily circuit-breaker and tunable sensitivity/smoothing knobs • Live admin panel to adjust the pricing formula in real time, with a validated audit log of every change • Polished, accessible dark "finte

A Stock Market for Music Artists

https://rapp-stock.vercel.app Rapp Stock is a live, stock-market-style web app where music artists are traded like assets — their "share price" driven by real streaming data instead of random numbers. I designed and built the full pipeline end-to-end: a scheduled ingest pulls live listening data from the Last.fm API, stores it as immutable, timestamped snapshots, and feeds a deterministic pricing engine that moves each artist's price based on how their growth compares to their own recent trend. Every price move is fully explainable — each artist page has a "Why'd it move?" breakdown showing the exact stored numbers behind the change, so nothing is a black box. Highlights: • Custom pricing engine (pure, fully unit-tested) that reacts to growth surprise, with a daily circuit-breaker and tunable sensitivity/smoothing knobs • Live admin panel to adjust the pricing formula in real time, with a validated audit log of every change • Polished, accessible dark "finte

A Stock Market for Music Artists

13979776
https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

13963932
I built a fast, two-page promotional and catalogue site for a Vancouver-based reseller who needed to take orders without the cost or overhead of a full e-commerce backend. Instead of a payment gateway, the cart assembles the customer's selections into a pre-filled text message — quantities, line totals, grand total, and delivery details — that opens straight in their phone's messaging app, with payment handled cash on delivery. The whole thing ships as static HTML, CSS, and JS (no server, no database), so it loads almost instantly and costs next to nothing to host. I built the product catalogue as a single validated data source, matched the design 1:1 against the client's reference mockups at both mobile and desktop sizes, and put real care into the cart interactions — accessible modals, focus trapping, scroll locking, and no layout flash for returning visitors. Mobile-first throughout, since that's where nearly all the traffic lands.

Next.js catalogue & ordering site

I built a fast, two-page promotional and catalogue site for a Vancouver-based reseller who needed to take orders without the cost or overhead of a full e-commerce backend. Instead of a payment gateway, the cart assembles the customer's selections into a pre-filled text message — quantities, line totals, grand total, and delivery details — that opens straight in their phone's messaging app, with payment handled cash on delivery. The whole thing ships as static HTML, CSS, and JS (no server, no database), so it loads almost instantly and costs next to nothing to host. I built the product catalogue as a single validated data source, matched the design 1:1 against the client's reference mockups at both mobile and desktop sizes, and put real care into the cart interactions — accessible modals, focus trapping, scroll locking, and no layout flash for returning visitors. Mobile-first throughout, since that's where nearly all the traffic lands.

Next.js catalogue & ordering site

I built a fast, two-page promotional and catalogue site for a Vancouver-based reseller who needed to take orders without the cost or overhead of a full e-commerce backend. Instead of a payment gateway, the cart assembles the customer's selections into a pre-filled text message — quantities, line totals, grand total, and delivery details — that opens straight in their phone's messaging app, with payment handled cash on delivery. The whole thing ships as static HTML, CSS, and JS (no server, no database), so it loads almost instantly and costs next to nothing to host. I built the product catalogue as a single validated data source, matched the design 1:1 against the client's reference mockups at both mobile and desktop sizes, and put real care into the cart interactions — accessible modals, focus trapping, scroll locking, and no layout flash for returning visitors. Mobile-first throughout, since that's where nearly all the traffic lands.

Next.js catalogue & ordering site

13725480
I developed a subscription-based platform for the Bubbl.ai Chrome Extension using Vue/Nuxt.js for the frontend and Express.js for the backend. The platform enables users to seamlessly subscribe and access Bubbl, an AI-powered writing and ideation tool that helps users write better anywhere—Gmail, Google Docs, LinkedIn, Twitter, and more.

Bubbl.ai – AI Writing Subscriptions

I developed a subscription-based platform for the Bubbl.ai Chrome Extension using Vue/Nuxt.js for the frontend and Express.js for the backend. The platform enables users to seamlessly subscribe and access Bubbl, an AI-powered writing and ideation tool that helps users write better anywhere—Gmail, Google Docs, LinkedIn, Twitter, and more.

Bubbl.ai – AI Writing Subscriptions

I developed a subscription-based platform for the Bubbl.ai Chrome Extension using Vue/Nuxt.js for the frontend and Express.js for the backend. The platform enables users to seamlessly subscribe and access Bubbl, an AI-powered writing and ideation tool that helps users write better anywhere—Gmail, Google Docs, LinkedIn, Twitter, and more.

Bubbl.ai – AI Writing Subscriptions

13722929
I built this project using React and Tailwind CSS, integrated with Shopify, and structured the UI following the Atomic Design principle. The application is modular, scalable, and easy to maintain, with reusable components and a clean design system. I focused on performance, responsiveness, and maintainability while delivering a seamless user experience aligned with modern frontend best practices.

React Shopify UI with Atomic Design

I built this project using React and Tailwind CSS, integrated with Shopify, and structured the UI following the Atomic Design principle. The application is modular, scalable, and easy to maintain, with reusable components and a clean design system. I focused on performance, responsiveness, and maintainability while delivering a seamless user experience aligned with modern frontend best practices.

React Shopify UI with Atomic Design

I built this project using React and Tailwind CSS, integrated with Shopify, and structured the UI following the Atomic Design principle. The application is modular, scalable, and easy to maintain, with reusable components and a clean design system. I focused on performance, responsiveness, and maintainability while delivering a seamless user experience aligned with modern frontend best practices.

React Shopify UI with Atomic Design

I built this project using React and Tailwind CSS, integrated with Shopify, and structured the UI following the Atomic Design principle. The application is modular, scalable, and easy to maintain, with reusable components and a clean design system. I focused on performance, responsiveness, and maintainability while delivering a seamless user experience aligned with modern frontend best practices.

React Shopify UI with Atomic Design

14014297
Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

Live site: https://bestiaireceramique.org Bestiaire de Céramique Art Nouveau is a scholarly online archive of Art Nouveau ceramic works, built end to end for an independent curator. The site catalogs each object with detailed provenance, literature references, and inline footnotes, and organizes the collection by zoological classification and geographic origin. Key features I built: - Custom WordPress theme on ACF Pro with three custom post types (Objects, Artists and Makers, Sources) - Two hierarchical taxonomies: Animals (with subcategories for birds, mammals, fish, reptiles and amphibians, invertebrates, and fantastical creatures) and Regions (with country, department, and locality levels) - Custom Gutenberg footnote block that pulls citations from the Source post type and displays them as inline popups on public object pages - Two way ACF relationships between Objects and Artists so cross references auto populate on both sides - Custom search across all post types with taxonomy

Custom Scholarly WordPress CMS

13990277
https://rapp-stock.vercel.app Rapp Stock is a live, stock-market-style web app where music artists are traded like assets — their "share price" driven by real streaming data instead of random numbers. I designed and built the full pipeline end-to-end: a scheduled ingest pulls live listening data from the Last.fm API, stores it as immutable, timestamped snapshots, and feeds a deterministic pricing engine that moves each artist's price based on how their growth compares to their own recent trend. Every price move is fully explainable — each artist page has a "Why'd it move?" breakdown showing the exact stored numbers behind the change, so nothing is a black box. Highlights: • Custom pricing engine (pure, fully unit-tested) that reacts to growth surprise, with a daily circuit-breaker and tunable sensitivity/smoothing knobs • Live admin panel to adjust the pricing formula in real time, with a validated audit log of every change • Polished, accessible dark "finte

A Stock Market for Music Artists

https://rapp-stock.vercel.app Rapp Stock is a live, stock-market-style web app where music artists are traded like assets — their "share price" driven by real streaming data instead of random numbers. I designed and built the full pipeline end-to-end: a scheduled ingest pulls live listening data from the Last.fm API, stores it as immutable, timestamped snapshots, and feeds a deterministic pricing engine that moves each artist's price based on how their growth compares to their own recent trend. Every price move is fully explainable — each artist page has a "Why'd it move?" breakdown showing the exact stored numbers behind the change, so nothing is a black box. Highlights: • Custom pricing engine (pure, fully unit-tested) that reacts to growth surprise, with a daily circuit-breaker and tunable sensitivity/smoothing knobs • Live admin panel to adjust the pricing formula in real time, with a validated audit log of every change • Polished, accessible dark "finte

A Stock Market for Music Artists

https://rapp-stock.vercel.app Rapp Stock is a live, stock-market-style web app where music artists are traded like assets — their "share price" driven by real streaming data instead of random numbers. I designed and built the full pipeline end-to-end: a scheduled ingest pulls live listening data from the Last.fm API, stores it as immutable, timestamped snapshots, and feeds a deterministic pricing engine that moves each artist's price based on how their growth compares to their own recent trend. Every price move is fully explainable — each artist page has a "Why'd it move?" breakdown showing the exact stored numbers behind the change, so nothing is a black box. Highlights: • Custom pricing engine (pure, fully unit-tested) that reacts to growth surprise, with a daily circuit-breaker and tunable sensitivity/smoothing knobs • Live admin panel to adjust the pricing formula in real time, with a validated audit log of every change • Polished, accessible dark "finte

A Stock Market for Music Artists

13979776
https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

https://churchsync.online/Welcome https://play.google.com/store/apps/details?id=com.base69b50ff907a1420ffa5084b3.app https://apps.apple.com/us/app/church-sync/id6761640751 ChurchSync is a mobile-first platform that helps churches manage day-to-day operations and keep members engaged. Leaders get tools for members, events, announcements, groups, attendance, and reporting. Members get a simple hub for news, prayer requests, giving, and profile management. I built the native iOS and Android subscription layer for the app — wrapping the existing web app in a custom Capacitor shell and integrating RevenueCat for App Store and Google Play in-app purchases. Key work included: • Custom Capacitor wrapper build for full ownership of the build pipeline (instead of relying on third-party wrapping services) • RevenueCat integration with monthly ($7.99) and annual ($79.99) subscriptions, including a 7-day free trial • Multi-church access logic — users can switch between their own church (full acc

ChurchSync — iOS & Android App

13963932
I built a fast, two-page promotional and catalogue site for a Vancouver-based reseller who needed to take orders without the cost or overhead of a full e-commerce backend. Instead of a payment gateway, the cart assembles the customer's selections into a pre-filled text message — quantities, line totals, grand total, and delivery details — that opens straight in their phone's messaging app, with payment handled cash on delivery. The whole thing ships as static HTML, CSS, and JS (no server, no database), so it loads almost instantly and costs next to nothing to host. I built the product catalogue as a single validated data source, matched the design 1:1 against the client's reference mockups at both mobile and desktop sizes, and put real care into the cart interactions — accessible modals, focus trapping, scroll locking, and no layout flash for returning visitors. Mobile-first throughout, since that's where nearly all the traffic lands.

Next.js catalogue & ordering site

I built a fast, two-page promotional and catalogue site for a Vancouver-based reseller who needed to take orders without the cost or overhead of a full e-commerce backend. Instead of a payment gateway, the cart assembles the customer's selections into a pre-filled text message — quantities, line totals, grand total, and delivery details — that opens straight in their phone's messaging app, with payment handled cash on delivery. The whole thing ships as static HTML, CSS, and JS (no server, no database), so it loads almost instantly and costs next to nothing to host. I built the product catalogue as a single validated data source, matched the design 1:1 against the client's reference mockups at both mobile and desktop sizes, and put real care into the cart interactions — accessible modals, focus trapping, scroll locking, and no layout flash for returning visitors. Mobile-first throughout, since that's where nearly all the traffic lands.

Next.js catalogue & ordering site

I built a fast, two-page promotional and catalogue site for a Vancouver-based reseller who needed to take orders without the cost or overhead of a full e-commerce backend. Instead of a payment gateway, the cart assembles the customer's selections into a pre-filled text message — quantities, line totals, grand total, and delivery details — that opens straight in their phone's messaging app, with payment handled cash on delivery. The whole thing ships as static HTML, CSS, and JS (no server, no database), so it loads almost instantly and costs next to nothing to host. I built the product catalogue as a single validated data source, matched the design 1:1 against the client's reference mockups at both mobile and desktop sizes, and put real care into the cart interactions — accessible modals, focus trapping, scroll locking, and no layout flash for returning visitors. Mobile-first throughout, since that's where nearly all the traffic lands.

Next.js catalogue & ordering site

13725480
I developed a subscription-based platform for the Bubbl.ai Chrome Extension using Vue/Nuxt.js for the frontend and Express.js for the backend. The platform enables users to seamlessly subscribe and access Bubbl, an AI-powered writing and ideation tool that helps users write better anywhere—Gmail, Google Docs, LinkedIn, Twitter, and more.

Bubbl.ai – AI Writing Subscriptions

I developed a subscription-based platform for the Bubbl.ai Chrome Extension using Vue/Nuxt.js for the frontend and Express.js for the backend. The platform enables users to seamlessly subscribe and access Bubbl, an AI-powered writing and ideation tool that helps users write better anywhere—Gmail, Google Docs, LinkedIn, Twitter, and more.

Bubbl.ai – AI Writing Subscriptions

I developed a subscription-based platform for the Bubbl.ai Chrome Extension using Vue/Nuxt.js for the frontend and Express.js for the backend. The platform enables users to seamlessly subscribe and access Bubbl, an AI-powered writing and ideation tool that helps users write better anywhere—Gmail, Google Docs, LinkedIn, Twitter, and more.

Bubbl.ai – AI Writing Subscriptions

13722929
I built this project using React and Tailwind CSS, integrated with Shopify, and structured the UI following the Atomic Design principle. The application is modular, scalable, and easy to maintain, with reusable components and a clean design system. I focused on performance, responsiveness, and maintainability while delivering a seamless user experience aligned with modern frontend best practices.

React Shopify UI with Atomic Design

I built this project using React and Tailwind CSS, integrated with Shopify, and structured the UI following the Atomic Design principle. The application is modular, scalable, and easy to maintain, with reusable components and a clean design system. I focused on performance, responsiveness, and maintainability while delivering a seamless user experience aligned with modern frontend best practices.

React Shopify UI with Atomic Design

I built this project using React and Tailwind CSS, integrated with Shopify, and structured the UI following the Atomic Design principle. The application is modular, scalable, and easy to maintain, with reusable components and a clean design system. I focused on performance, responsiveness, and maintainability while delivering a seamless user experience aligned with modern frontend best practices.

React Shopify UI with Atomic Design

I built this project using React and Tailwind CSS, integrated with Shopify, and structured the UI following the Atomic Design principle. The application is modular, scalable, and easy to maintain, with reusable components and a clean design system. I focused on performance, responsiveness, and maintainability while delivering a seamless user experience aligned with modern frontend best practices.

React Shopify UI with Atomic Design

5.0 · 366 Reviews
366 Reviews
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Juan Alejandro

5.0

$500 USD

7 minutes ago

Desarrollador de Claude Code Requerido

Vladimir hizo un excelente trabajo organizando y estructurando una base de datos que originalmente no contaba con una estructura clara. Entendió rápidamente la complejidad del proyecto, detectó inconsistencias importantes y propuso soluciones prácticas para abordarlas de manera eficiente. Destaco especialmente su profesionalismo, capacidad analítica y buena comunicación. Quedé muy conforme con el resultado y lo recomiendo ampliamente

PHP
JavaScript
Software Architecture
HTML
API

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Ross

5.0

$1,500 AUD

2 days ago

Premium Corporate Website for an International Consulting & Sourcing Company

If Vladimir submits an offer for your project, my recommendation is simple: Hire him. He is genuinely a six-star freelancer—highly skilled, exceptionally fast and remarkably patient throughout the entire process. He listened carefully to all our feedback, took every idea on board and continued refining the work until the result was exceptional. His communication, professionalism and attention to detail were outstanding. I will definitely use Vladimir again for future projects.

PHP
Website Design
Graphic Design
SEO
WordPress

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Linsay

5.0

$3,500 USD

16 days ago

Non-Profit WordPress Site Redesign

Vladimir was an absolute joy to work with. After reading many responses to my job posting, his immediately jumped out as not being AI generated, and bringing up an issue that no one else had mentioned. Throughout the process he has been very clear about what fits within the scope of the project and the budget, prioritized assets and delivered them promptly. He was quick to make changes based on feedback and was very collaborative, going above and beyond what was asked of him. All the stars!

PHP
Website Design
Graphic Design
SEO
WordPress

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Todd

5.0

$11,380 USD

2 months ago

Scholarly CMS for Art Nouveau Ceramics

Vladimir did outstanding work on a complex custom WordPress archive for my Art Nouveau ceramics collection. He built custom object records, artist/maker pages, taxonomy indexes, image galleries, search, footnotes, private admin notes, and migrated the site to Kinsta. He was extremely responsive, technically strong, patient with detailed revisions, and clear in communication. I would happily work with him again and recommend him highly for sophisticated WordPress projects.

WordPress
User Interface / IA
CMS
Web Development
Web Design

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Nate

5.0

$6,040 AUD

2 months ago

Multi-Tier Subscription Integration

Vladimir's communication was great, he kept me informed of what was going on during the process and I enjoyed working together and appreciate the experience he brings to the table.

Mobile App Development
iPhone
Android
Objective C
iOS Development

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Experience

Freelancer

Apr, 2010 - Present

•

16 years, 4 months

Freelancer

Apr, 2010 - Present

•

16 years, 4 months

Various freelancer jobs such as Desktop Applications (C, C++, C#, Java), websites (ASP.NET, PHP, Javascript, React, Vue, Angular, Node), Database Administration (MySQL, MSSQL, NoSQL), Android Applications etc.

Apr, 2010 - Present

•

16 years, 4 months

Professor

Oct, 2001 - Present

•

24 years, 11 months

Technical school

Oct, 2001 - Present

•

24 years, 11 months

Working at Technical school. Teaching students programming techniques, algorithm, Visual C++/C#, Java, AutoCad and Pro/Engineer.

Oct, 2001 - Present

•

24 years, 11 months

Education

Specialisation

2002 - 2006

•

4 years

Flag of SERBIA

Serbia

2002 - 2006

•

4 years

Master

1992 - 1999

•

7 years

Flag of SERBIA

Serbia

1992 - 1999

•

7 years

Qualifications

Information Technology Specialist

2006

University of Kragujevac

Specialist for IT (UML design, PHP, MySQL)

2006

Publications

Modern School Information System in Internet environment

Faculty of Science, Kragujevac

Complete modeling (UML) and programming (PHP and MySQL) of School Information System.

Certifications

Basic Numeracy - Level 1

Basic Numeracy

US English - Level 1

US English

P

Preferred Freelancer Program SLA

Freelancer Orientation

Freelancer Orientation

C Programming - Level 1

C Programming

C# Programming - Level 1

C# Programming

E

Employer Orientation Exam

Java - Level 1

Java

SQL - Level 1

SQL

C++ - Level 1

C++

U

UML

U

UML

C# Programming - Level 2

C# Programming

F

Foundation vWorker Member

Freelancer logo US (International) / English
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