Backend Development is a critical part of any website or software product. It starts with understanding the client's goals and developing solutions that achieve those goals in a cost-effective and scalable way. Backend developers are responsible for more than just code: they have to have a strong understanding of databases, frameworks, and development in general. A backend developer uses this knowledge to turn complicated customer requirements into a efficient, automated solutions that the user experience (UX) team can work with.

When it comes to Backend Development, experience matters - you want someone who's seen a variety of projects and knows the best technology to use for your specific scenario.

Here's some projects that our expert Backend Developer made real:

  • Developing connected systems between websites and local servers
  • Integrating software systems using modern real-time protocols
  • Building bespoke solutions tailored to customer requirements
  • Taking over existing projects and resolving tricky bugs
  • Developing custom solutions using tried and tested frameworks

Backend Development encompasses a wide variety of skills and technologies, so it helps to have an experienced developer on your team who can navigate the complexities of building high-quality solutions. Our expert developers have already undertaken a variety of different projects and can jump into yours with confidence - benefit from their expertise, get your project completed quickly and correctly, and reduce time-to-market for your product. Get in touch today to discuss bringing your project to life, or post your own project in Freelancer.com to hire an experienced Backend Developer.

Asiakkaamme antoivat 148,347 arvostelussa keskimääräisen arvosanan Backend Developers 4.9 / 5 tähteä.
Palkkaa Backend Developers

Backend Development is a critical part of any website or software product. It starts with understanding the client's goals and developing solutions that achieve those goals in a cost-effective and scalable way. Backend developers are responsible for more than just code: they have to have a strong understanding of databases, frameworks, and development in general. A backend developer uses this knowledge to turn complicated customer requirements into a efficient, automated solutions that the user experience (UX) team can work with.

When it comes to Backend Development, experience matters - you want someone who's seen a variety of projects and knows the best technology to use for your specific scenario.

Here's some projects that our expert Backend Developer made real:

  • Developing connected systems between websites and local servers
  • Integrating software systems using modern real-time protocols
  • Building bespoke solutions tailored to customer requirements
  • Taking over existing projects and resolving tricky bugs
  • Developing custom solutions using tried and tested frameworks

Backend Development encompasses a wide variety of skills and technologies, so it helps to have an experienced developer on your team who can navigate the complexities of building high-quality solutions. Our expert developers have already undertaken a variety of different projects and can jump into yours with confidence - benefit from their expertise, get your project completed quickly and correctly, and reduce time-to-market for your product. Get in touch today to discuss bringing your project to life, or post your own project in Freelancer.com to hire an experienced Backend Developer.

Asiakkaamme antoivat 148,347 arvostelussa keskimääräisen arvosanan Backend Developers 4.9 / 5 tähteä.
Palkkaa Backend Developers

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    165 löydetyt työt

    I’m searching for someone who can comfortably switch between front-end and back-end work while also handling day-to-day bidding on freelance marketplaces for me. The development stack is flexible at this stage, so if you are equally happy working in React, Angular, Vue, Node.js, Django, Rails—or any comparable frameworks—feel free to bring your strengths to the table. Here’s what the role looks like: • Code what’s needed on both the client and server sides, from fixing small UI bugs to adding new database-driven features. • Draft, refine, and submit compelling proposals on freelance platforms, keeping an eye on suitable projects and tailoring each bid to maximise our win rate. • Provide quick progress updates so we can keep momentum and ad...

    €65 Average bid
    €65 Keskimäär. tarjous
    27 tarjoukset

    My TypeScript-based app needs a fresh set of eyes. Two problem zones keep slowing development: the user interface occasionally renders the wrong state, and the data-processing layer throws intermittent logic errors. I’d like you to trace the root causes, patch them, then reorganise the affected modules so the codebase is cleaner and easier to extend. Because the troublesome behaviour reveals details of planned features, I’ll share concrete scenarios and test cases once we have a signed NDA. After that you will have full repo access, current build scripts, and unit test coverage reports. Deliverables • Fixed UI and data-processing bugs, confirmed by our existing automated tests • Refactored, well-commented TypeScript modules that follow our linting rules • A...

    €21 Average bid
    €21 Keskimäär. tarjous
    37 tarjoukset

    I am looking for a developer to build a lightweight web-based security scanning tool that can analyze websites and detect a few common security issues. The goal of this project is to create a simple tool where a user can enter a website URL and receive a report highlighting potential security weaknesses. The application does not need to be extremely advanced. The focus is on a clean interface and detecting a few important vulnerabilities. Main Features The tool should allow the user to: • Enter a website URL to scan • Check if important HTTP security headers are present (Content-Security-Policy, X-Frame-Options, HSTS, etc.) • Detect if the site is running on HTTPS or HTTP • Identify missing security headers • Detect exposed directories such as /admin, /login, ...

    €27 Average bid
    €27 Keskimäär. tarjous
    46 tarjoukset
    Resolve Clerk Login Loop Issue
    6 päivää left
    Varmennettu

    I’m building a web app on Replit and deploying it on Railway. Clerk’s components already render on the site and the user can submit their credentials, but after the redirect the page never reaches the dashboard—it just sits on the loading screen and repeats the sign-in loop. There’s no visible error message in the browser; the session simply never finalises. What I need • Review my current Clerk configuration (frontend and backend keys, JWT settings, callback URLs, environment variables). • Check the Replit dev environment versus the Railway production build for any mismatched origins or missing secrets. • Correct any routing or middleware that might be blocking the session token from persisting. • Confirm that, once fixed, a successful ...

    €20 Average bid
    €20 Keskimäär. tarjous
    44 tarjoukset

    Necesito desarrollar una aplicación móvil que permita a los asistentes a partidos de fútbol comprar comida rápida desde su asiento y retirarla por una fila express sin perder tiempo, sobre todo durante el entretiempo. La app debe funcionar tanto en iOS como en Android. Flujo básico esperado: 1. El usuario abre la app, selecciona el partido de fútbol activo y la tribuna o sector donde se encuentra. 2. Se despliega un menú reducido, pensado exclusivamente en comida rápida estilo “modo cancha” (bebidas, snacks, hamburguesas, hot-dogs, etc.). 3. El usuario elige, paga dentro de la aplicación con el método que prefiera, y recibe un QR único. 4. Cuando el pedido esté listo, enviamos una notificaci&oa...

    €5509 Average bid
    €5509 Keskimäär. tarjous
    46 tarjoukset

    I need a web-based oddsmatcher focused solely on sports betting. The tool must pull live odds from multiple bookmakers, refresh them in real time, and present the data in a clean, responsive interface that works in any modern browser. A built-in betting calculator should instantly show potential profit or liability for matched-betting scenarios, while automated alerts—by email, browser push, or both—must notify users the moment a profitable or arbitrageable spread appears. For the back end, you will aggregate odds through official or publicly available bookmaker APIs, normalise the data, and keep latency to a minimum. The front end should be lightweight yet polished—React, Vue, or a similarly modern framework is fine so long as the UI remains intuitive on desktop and mob...

    €436 Average bid
    €436 Keskimäär. tarjous
    113 tarjoukset

    I’m ready to bring a new full-stack engineer onto the team and would like to work with someone based in Pakistan. Day to day you’ll be handling both front-end and back-end tasks, moving comfortably from interface tweaks to API design, while keeping code quality and clear communication at the heart of everything you do. You should feel confident writing clean, maintainable code, troubleshooting production issues, and explaining your decisions in straightforward English during stand-ups or chat. Whether the stack leans toward JavaScript frameworks, Python, or another modern toolset, I value solid problem-solving skills and proactive collaboration more than any single technology badge. If you’ve shipped web apps end-to-end, enjoy iterative development with frequent feedbac...

    €18 / hr Average bid
    €18 / hr Keskimäär. tarjous
    93 tarjoukset

    I'm seeking experienced mobile app developers for a 6 month contract to create a cross-platform social networking application for both iOS and Android. The app will include essential features such as: - Messaging system - User profiles - News feed - User favorites lists Ideal candidates should have: - Proven experience in developing social networking apps - Strong skills in both iOS and Android platforms - Expertise in real-time messaging integration - UI/UX design experience to ensure a user-friendly interface - Knowledge of backend technologies to support user data and interactions Please provide a portfolio with relevant projects and estimated timelines.

    €9 / hr Average bid
    €9 / hr Keskimäär. tarjous
    92 tarjoukset
    Byndly Booking
    6 päivää left
    Varmennettu

    Flutter App for Guest Portal We are looking for an experienced Flutter developer to build a mobile app that mimics the core flow and functionality of our existing guest portal: Project Overview The app is for fitness/wellness users to interact with our platform as guests or registered users. The backend is already built in Supabase, so this project is focused on Flutter frontend development and Supabase integration. Main Features Required The mobile app should allow users to: • Visit the app as a guest • Register a new account • Login • View available classes/PTs/Spa/Courts • Book classes/PTs/Spa/Courts • Pay for classes/PTs/Spa/Courts • Cancel bookings/PTs/Spa/Courts Backend / Integration • Backend is already available in Supabase &b...

    €456 Average bid
    €456 Keskimäär. tarjous
    292 tarjoukset

    Nuestro portal actual funciona sobre Joomla y quiero darle un aspecto totalmente renovado sin abandonar el CMS. El objetivo es desarrollar una plantilla — o adaptar una existente — con un estilo clásico y profesional, cuidando la tipografía, paleta sobria y una navegación clara. Todo el contenido vigente debe migrarse sin pérdidas: artículos, menús, módulos, archivos adjuntos y meta-datos SEO. Además, necesito que las siguientes secciones conserven su estructura y URL para no afectar a nuestros usuarios ni al posicionamiento: • Página de inicio • Quiénes somos • Normatividad • Documentos • Preguntas frecuentes • Contáctenos • Mapa de sitio • Pre...

    €6 / hr Average bid
    €6 / hr Keskimäär. tarjous
    37 tarjoukset

    ** this is a predominantly backend development project. the previous developer scammed me and only did front end and design stuff. this is not the focus anymore. we need backend so please only contact if u know how to do backend and are willing to do it for the price listed. ** we are building core functionalities. PLEASE KEEP IN MIND THIS IS A LEAN STARTUP - It will grow organically and has a small user base to start. and for this phase will be 20k users or less, most likely 5k ish. so please do not upsell. Before reading, make sure you are skilled in the following technologies and *linking them all together for a cohesive website*: - github & railway linked - railway - mongo database - cloudflare - ImageKit - twilio sendgrid - *** MUST BE ABLE TO COMPLETE / PROGRAM A MANUAL ZELLE L...

    €1041 Average bid
    €1041 Keskimäär. tarjous
    144 tarjoukset

    I need the core functionality of a desktop program rebuilt as a browser-based application. The application is available here: The only features that must cross over are the real-time data routines: live data updates streamed from our internal databases and on-the-fly analytics that users currently rely on for quick decision-making. Your work starts with analysing how the existing desktop code ingests, processes, and visualises data, then designing a responsive web front-end and a robust back-end that replicate the same speed and accuracy inside any modern browser. WebSocket or equivalent push technology will be essential to keep latency low. I will provide access to the current source, schema details for the internal databases, and test data. The finished web app should: • Conn...

    €20 / hr Average bid
    €20 / hr Keskimäär. tarjous
    157 tarjoukset

    I need a custom module built for the JoomDonation eShop extension on Joomla. The module / plugin will give us the ability to hide or show at the product page any of the extra-custom fields we need . See attached files to see how the fields are created at general configuration, how the are shown at product edit page and how they are shown on frontend product page. Now we create as many extrafields needed ...but the are all shown on product page ...if we do not want one or more of them to show on frontend it is not possible...they all show. We want to be able to hide one or more in the front end ...at the backend at product edit they must show all of them...but in the front end to be able to hide any of them we do not want to be shown at customers. This module should be compatible with eS...

    €135 Average bid
    €135 Keskimäär. tarjous
    112 tarjoukset

    I’m ready to roll out a completely free membership system that works seamlessly on my existing website and on companion mobile apps. The goal is to give users a single account they can create once, then use everywhere—no paywalls, no hidden tiers—just straightforward access. Here’s what I need help with: • A secure sign-up / log-in flow that syncs data between the web front-end and both iOS and Android builds. • A lightweight user-management dashboard on the back-end so I can view, suspend, or delete accounts without touching the database directly. • API endpoints (or GraphQL schema, if you prefer) that the site and the apps can call for authentication, password reset, profile updates, and basic analytics hooks. • Clean code and clear docu...

    €16 / hr Average bid
    €16 / hr Keskimäär. tarjous
    27 tarjoukset

    I’m ready to roll out a completely free membership system that works seamlessly on my existing website and on companion mobile apps. The goal is to give users a single account they can create once, then use everywhere—no paywalls, no hidden tiers—just straightforward access. Here’s what I need help with: • A secure sign-up / log-in flow that syncs data between the web front-end and both iOS and Android builds. • A lightweight user-management dashboard on the back-end so I can view, suspend, or delete accounts without touching the database directly. • API endpoints (or GraphQL schema, if you prefer) that the site and the apps can call for authentication, password reset, profile updates, and basic analytics hooks. • Clean code and clear docu...

    €31 / hr Average bid
    €31 / hr Keskimäär. tarjous
    58 tarjoukset
    Fiscal Printer Middleware Development
    6 päivää left
    Varmennettu

    We are looking for a software developer with experience in hardware or fiscal device integrations to build a backend service that exposes the functionality of a Tremol S25 fiscal printer through a secure REST API over HTTPS. The goal of the project is to create a middleware service that allows external applications (POS systems, ERP software, or web applications) to communicate with the Tremol S25 fiscal device using standard HTTP REST requests. Project Requirements: Integrate the official Tremol SDK (ZFPLAB or equivalent) to communicate with the Tremol S25 fiscal printer. Develop a REST API over HTTPS that exposes the main fiscal operations. The service will run on a Windows PC connected to the fiscal printer via USB. Clean architecture and well-structured code. Provide clear API document...

    €419 Average bid
    €419 Keskimäär. tarjous
    171 tarjoukset

    I'm in need of a proficient developer to create a Satta Matka app. The application will be available on Android and Web platforms. Your responsibility as the chosen developer will be to deliver a fully functioning app with a user-friendly admin panel to manage two starline games and main market games.

    €427 Average bid
    €427 Keskimäär. tarjous
    21 tarjoukset
    Grok API Integration & Account Management
    6 päivää left
    Varmennettu

    I want visitors to open my site, create a quick account, and immediately start chatting with Grok about one very specific topic that I will preload into the model. Your job is to wire the Grok API into the site, make sure users can sign up or log in, and allow them to launch one or multiple conversation threads that stay tied to their profile. Because I haven’t locked us into a particular CMS or location for the widget, you’re free to recommend the cleanest technical path—whether that means a lightweight pop-up on every page, an embedded window on just a few sections, or something in-between. What matters is that the chat feels native, remembers the user’s context, and always answers from the custom knowledge base I provide. You’ll handle: • Secure acco...

    €394 Average bid
    €394 Keskimäär. tarjous
    272 tarjoukset
    Responsive Mitgliederportal in 5 Tagen
    6 päivää left
    Varmennettu

    Wichtig - erst lesen !!!! Dann Gebot abgeben - keine Nachbehandlung- ersparen sie uns beiden bitte Zeit und ärger!!!! Ich benötige innerhalb von fünf Tagen eine komplett funktionsfähige Website im Responsive Design. Sämtliche Seiten-Layouts, Grafiken und Grob-Codes liegen bereits in Figma vor: (deutsch & englisch). Was noch fehlt, ist die saubere Umsetzung – Frontend und Backend – sowie ein schlanker Admin-Bereich. Kernfunktionen für das öffentliche Portal • Benutzeranmeldung • Mitgliederverwaltung • Statistikberichte (Dashboard für eingeloggte User) Erweiterter Admin-Bereich • Benutzerinformationen bearbeiten • Mitgliedschaftsverwaltung (Anmeldung / bezahlte Mitgliedschaften) • Sta...

    €1026 Average bid
    €1026 Keskimäär. tarjous
    100 tarjoukset

    Full-Time Django Developer Needed (India Only) We are looking for a full-time experienced Django Developer from India to join our trading prop firm project for long-term collaboration. Individual developers only — No agencies, companies, or teams. This position is strictly for developers based in India. Full-time availability (40+ hours per week) is required. Minimum 8+ years of professional experience in Django development is mandatory. =>Required Skills 3+ years of strong experience with Django and Django REST Framework Experience building scalable, high-performance backend systems Strong API architecture and development skills Payment gateway integration experience Database optimization (PostgreSQL preferred) Strong understanding of authentication, authorization & ...

    €532 Average bid
    €532 Keskimäär. tarjous
    22 tarjoukset

    I’m kicking off the creation of a brand-new web application and need a programmer who can guide the project from first commit to production release. You’ll take my concept and implement both the user-facing front end and the server-side back end, then deploy everything to a live environment. You are free to choose a modern tech stack—React, Vue, or plain JavaScript on the front end; Node.js, Django, or a comparable framework on the back end—so long as it results in clean, secure, well-documented code. Database design, API integrations, user authentication, and responsive UI are all part of the scope. I already have wireframes and a feature list ready to share once we start. Deliverables • Fully functional web application that matches the provided feature li...

    €479 Average bid
    €479 Keskimäär. tarjous
    263 tarjoukset
    ML, FPGA, Backend Optimization Experts
    6 päivää left
    Varmennettu

    I’m expanding Eigen Computing’s stealth-mode R&D team and need senior-level talent who can tackle optimisation at scale. We are building a hardware-accelerated probabilistic engine that runs QUBO/Ising workloads for Logistics, Finance, and Cyber-Intelligence, and I’m open to engaging specialists across several tracks: • ML Engineer – craft graph neural networks and matrix-compression pipelines that translate complex optimisation problems into sparse, hardware-friendly representations. • FPGA Engineer – write VHDL/Verilog kernels for AWS F1, pushing the solver to micro-second latency. • Backend Architect – design a high-performance API layer in Go, Rust or Python that orchestrates FPGA instances, manages job queues and exposes RE...

    €16 Average bid
    €16 Keskimäär. tarjous
    24 tarjoukset
    Pure PHP Custom Web App
    6 päivää left

    I am building a full-scale web application written in pure PHP—no frameworks—paired with MySQL (or MariaDB) and modern vanilla JS on the front end. The project is completely custom, so we will define the architecture together, but several core components are non-negotiable. At the heart of the system I need a solid user authentication flow that supports registration, email/OTP verification, password resets, and social-login extensibility. Every record we store must be tied into a role-based access control layer so I can fine-tune permissions for admins, managers, HR staff, accountants, and standard users. Data will drive the app, so robust CRUD screens, advanced filtering, and downloadable reports (CSV, PDF) are essential. I expect clean, well-commented code, prepared stateme...

    €250 Average bid
    €250 Keskimäär. tarjous
    75 tarjoukset

    I’m building a mobile-only marketplace that lets independent gyms list their facilities while giving users a single place to discover nearby gyms, book sessions, check in, and track their visits. Every user will authenticate with a mobile number and one-time password; no emails or social logins are required. Core user flow • Browse gyms on a location-aware map or list • Reserve a workout slot and pay in-app • Receive an automatically generated QR code for entry • Scan the code at the gym to register the visit, which updates the personal visit log in real time Gym partner flow • Register the gym, set schedules and capacity limits directly in the app • Scan incoming QR codes at the front desk to confirm attendance • View automated ...

    €618 Average bid
    €618 Keskimäär. tarjous
    108 tarjoukset
    Migrate Replit Site to Railway
    5 päivää left
    Varmennettu

    I’ve built a dynamic web app on Replit that relies on a PostgreSQL database and uses Clerk for user sign-up and login. I now need the whole project running smoothly on Railway. Here’s what I’m looking for: • Move the existing codebase from Replit to a new Railway project • Provision or connect the PostgreSQL instance on Railway and migrate the current data • Update all environment variables (including Clerk keys) so authentication continues to work without any interruption • Adjust build or start scripts if needed so Railway’s deploy pipeline runs cleanly • Verify that sign-up, login, and every database-backed route behave exactly the same in production If you’ve already deployed apps with Clerk and PostgreSQL on Railway, th...

    €22 Average bid
    €22 Keskimäär. tarjous
    49 tarjoukset
    Enhance PHP System Integrations
    5 päivää left
    Varmennettu

    I’m looking to bring in a seasoned PHP developer who can jump straight into feature work on our integrations layer. The immediate goal is to expand and refine how our platform connects with other services, so your day-to-day will revolve around PHP-driven enhancements that let us talk smoothly to: • Payment gateways • Third-party APIs • Internal databases Much of the logic sits server-side, but our UI is split between Vue.js and some legacy AngularJS modules, so knowing your way around both frameworks will help you wire new data flows all the way to the front-end without hand-offs. Clear, reliable communication is a must because I need to sync with you in real time for at least four hours each workday; that overlap lets us review pull requests together, clarif...

    €11 / hr Average bid
    €11 / hr Keskimäär. tarjous
    138 tarjoukset

    ---------------------- Notice: Automatic proposals using AI are immediately rejected. ---------------------- We are building a retirement savings calculator web application that helps users determine how long their savings will last in retirement. Users will enter basic financial inputs (age, savings, spending, etc.), and the application will run a projection model and display the results visually. The app will also offer a paid downloadable PDF report summarizing the results. This is an MVP project with well-defined requirements. Core Features The application will include: 1. Retirement calculator Users enter: • current age • retirement age • life expectancy • current savings • monthly spending • expected investment return • inflation rate The system w...

    €1815 Average bid
    €1815 Keskimäär. tarjous
    287 tarjoukset

    Job Title: Senior Full-Stack Developer Needed – NestJS + React/TypeScript Fuel Levy Pricing Engine for Rideshare Platform Job Description: I am looking for a highly skilled full-stack developer to build the first production-ready version of a vehicle-specific fuel levy / energy levy pricing engine for my rideshare platform based in Queensland, Australia. This system must be designed as a secure backend-driven pricing engine, where the commercial logic remains private on the server and is not exposed to the browser. The purpose of the system is to calculate a fair trip-based fuel or energy levy using approved vehicle data and live/local fuel pricing inputs, with support for petrol, diesel, hybrid, and EV vehicles. The backend must be built using Node.js, NestJS, TypeScript, Prisma, a...

    €337 Average bid
    €337 Keskimäär. tarjous
    215 tarjoukset
    Music Streaming and Release Platform
    5 päivää left
    Varmennettu

    I'm looking to develop a comprehensive music release and streaming platform that caters to both artists and fans. The platform should not only allow users to stream and purchase music but also provide artist profiles and potentially a collaboration center. Key Features: - Music Streaming: High-quality, reliable streaming. - Music Purchasing: Secure, user-friendly purchasing options. - Artist Profiles: Detailed profiles with bios, discographies, and more. - Collaboration Center (potential): A space for artists to connect and collaborate. Ideal Skills and Experience: - Experience in developing music platforms or similar applications. - Strong understanding of streaming technology. - Expertise in secure payment processing. - UI/UX design skills for an intuitive user experience. - Backe...

    €704 Average bid
    €704 Keskimäär. tarjous
    87 tarjoukset

    Quiero lanzar la página oficial de una coach de fitness online y convertirla en una plataforma de membresías “tipo Netflix”, donde los usuarios activos puedan ver programas de entrenamiento pregrabados desde cualquier dispositivo. Alcance principal • Página de inicio: presentación de la coach, beneficios de la suscripción y botón de registro claro. • Catálogo de programas: listado de rutinas en video accesible mediante un menú de navegación, con opción de filtrar o buscar por nivel o duración más adelante. • Perfil del usuario: área privada para gestionar datos personales, ver el estado de la suscripción y el historial de clases vistas. Funcionalidades clave...

    €406 Average bid
    €406 Keskimäär. tarjous
    88 tarjoukset
    Full Stack Web App Development
    5 päivää left
    Varmennettu

    I need a full-stack web application built from concept to live deployment. This includes planning the architecture, designing an intuitive responsive interface, implementing secure back-end logic, integrating a database, writing clean APIs, and setting up automated tests as well as CI/CD pipelines. The finished app must run smoothly on modern browsers, scale easily in a cloud environment, and come with clear documentation so I can maintain or extend it later. Deliverables: • Complete source code in a Git repository • Deployed, production-ready instance on my chosen cloud host • Step-by-step setup and maintenance documentation • Basic test suite proving core functions work out of the box Acceptance criteria: the code installs with one command, all tests pass, and...

    €158 Average bid
    €158 Keskimäär. tarjous
    99 tarjoukset

    Our project is already developed using PHP and Laravel, but we are currently facing a few issues related to API integration and payment gateway functionality. We are looking for an experienced backend developer who can quickly analyze the system and resolve these errors. Responsibilities Debug and fix Laravel backend issues Resolve API integration errors Fix payment gateway related problems Ensure the system works smoothly after fixes Review backend code and improve stability if needed Requirements Strong experience with PHP and Laravel Experience with API integrations Experience with payment gateway debugging Good knowledge of MySQL and backend debugging Ability to quickly identify and fix issues Project Details Project Type: Bug fixing / troubleshooting Experience Level: Expert Possi...

    €18 Average bid
    €18 Keskimäär. tarjous
    31 tarjoukset
    Laravel & React SaaS MVP
    5 päivää left
    Varmennettu

    We are building a SaaS MVP aimed at business clients that will let users log in, upload documents, extract the key data with OCR and review the results in a real-time dashboard. The stack is already chosen: React/ for the front end and Laravel (PHP) for the back end, so you can focus on clean architecture rather than tool selection. Core scope • Secure user authentication with role management • Document upload pipeline that triggers OCR and stores the parsed output • A reporting/dashboard view that lets users search, filter, and export the extracted data If interested, please include: • Links to at least two production SaaS platforms you’ve built or contributed to • A short description of your role in the architecture • Relevant experience wit...

    €9 / hr Average bid
    Salassapitosopimus
    €9 / hr Keskimäär. tarjous
    166 tarjoukset

    I’m ready to turn a fresh social-networking idea into a polished iOS app focused squarely on entertainment. The first release needs just one mission-critical feature: a real-time messaging system that feels as fluid as Apple’s own Messages. Everything else—profiles, content sharing, and any flashy extras—can wait for later iterations, so your attention can stay on building a rock-solid chat experience. Here’s what I have in mind: • Swift or SwiftUI codebase that compiles cleanly in the latest Xcode • Secure user authentication (Apple ID preferred, but I’m open to Firebase/Auth0 if you have a strong argument) • 1-to-1 and group messaging with push notifications that actually land • A lightweight, modern interface that looks at ...

    €1952 Average bid
    €1952 Keskimäär. tarjous
    232 tarjoukset

    Saya sedang mencari bantuan untuk membangun sebuah platform sosial media yang fokus pada pengguna Android. Prioritas utama saya adalah sisi pengembangan web—backend yang ringan, terstruktur, dan mudah dipelihara—karena semua data, otentikasi, dan logika bisnis akan dikelola di sana sebelum diteruskan ke aplikasi Android. Lingkup pekerjaan yang saya perlukan: • Merancang dan membangun backend berbasis web (Node.js, Laravel, atau stack serupa) lengkap dengan API REST/GraphQL. • Mengembangkan aplikasi Android yang terhubung ke backend tersebut, minimal mencakup alur pendaftaran, login, pembuatan profil, unggah konten (teks + gambar), serta feed linimasa. • Menyusun dokumentasi setup lokal dan deployment agar saya dapat mengelola dan memperbarui proyek secara ma...

    €17 / hr Average bid
    €17 / hr Keskimäär. tarjous
    11 tarjoukset

    The platform monitors how brands appear in AI search engines (ChatGPT, Gemini, Perplexity). We need development for: • SaaS dashboard • AI analysis engine • prompt generation • competitor analysis • subscription system Estimated timeline: 3–4 months We have a full technical specification available.

    €12 / hr Average bid
    €12 / hr Keskimäär. tarjous
    239 tarjoukset

    I need a bespoke website that presents my business as a clean, modern portfolio. The look I have in mind is unmistakably modern and minimalistic—plenty of white space, tight typography, and subtle animations that keep the focus on the work itself rather than on decorative clutter. What the site must do • Act as a showcase: visitors should immediately see curated image galleries alongside short, well-structured articles that explain each project or service. • Load fast and scale well on mobile, tablet, and desktop. • Give me a simple way to update both the images and the accompanying text without touching code—either a lightweight CMS or a custom admin panel is fine as long as it’s intuitive. • Include essentials like a contact form, basic on-p...

    €105 Average bid
    €105 Keskimäär. tarjous
    83 tarjoukset

    In java based architecture applications, we have used Backend Dropwizard framework (Jetty) instead of it, we have to replace it with Backend Spring Boot framework Also, in this application, we have to replace DynamoDB database with Apache Cassandra instead of it. migration plan Current flow - Client / Messenger App -> WebSocket Layer -> Redis - Cache-> gRPC over UDS -> Dropwizard (Jetty) -> DynamoDB (message store), FoundationDB for metadata ---------------------------- Required flow 1) Replacing Dropwizard → Spring Boot 2) Replacing DynamoDB→ Cassandra (message data) WebSocket layer logic in the Messenger application. → Elixir → (gRPC Request over UDS) → Spring Boot (Client → Phoenix → gRPC → Spring → Cassandra) 1) Load Ba...

    €80 Average bid
    €80 Keskimäär. tarjous
    66 tarjoukset
    WordPress-to-GHL Migration
    5 päivää left
    Varmennettu

    I’m ready to retire my current WordPress site and rebuild it directly inside my GHL CRM environment. The existing WordPress install holds pages like about us, about team, services, packages, blogs and others and only a subset of its plugins actually matter to my day-to-day operations. Those selected plugins need to live on in the new setup, either through native GHL features or cleanly coded work-arounds so I don’t lose any functionality. Also, the migration has to be at the URL level, I want exact URL to URL mapped from old environment to new one. Here’s what I need from you: • Copy the live WordPress pages, designs, and media into GHL’s website builder so the front-end looks and behaves the same—or better—inside the CRM. • Recreate or rep...

    €65 Average bid
    €65 Keskimäär. tarjous
    33 tarjoukset
    AI Multi-Platform Streaming App
    5 päivää left
    Varmennettu

    I’m building an entertainment app that streams video on Android, iOS, LG webOS, and Samsung Tizen. The core experience centres on both live streaming and an on-demand catalogue, with an AI layer that surfaces personalised recommendations and smart search results in real time. The flow I have in mind is straightforward: users sign in once, land on a home screen tailored by the recommendation engine, and can jump between live channels or the on-demand library without friction. Playback must support adaptive-bitrate HLS/DASH, multiple audio tracks, and subtitles. Because this spans mobile and smart-TV ecosystems, the UI needs to scale gracefully from touch interactions to remote-control navigation. I’ll provide brand assets, sample content feeds, and access to the existing CDN. ...

    €115 Average bid
    €115 Keskimäär. tarjous
    61 tarjoukset
    B2B Project Posting Module
    5 päivää left
    Varmennettu

    I need a self-contained module added to our custom-built B2B portal that lets clients post their project requirements and makes those posts visible to all registered vendors in a clean list view. Core workflow • A logged-in client clicks “Post a Project,” fills out a project-description field, and submits. • The project instantly appears for vendors inside a paginated list view ordered by newest first. • Any logged-in vendor can open a listing, read the details, and click “Respond” to start a private thread with the client. Essential features • Project description field with rich-text support and a 1 000-character limit. • Server-side validation and XSS protection. • Real-time notifications (email and in-dashboard alerts) to v...

    €107 Average bid
    €107 Keskimäär. tarjous
    29 tarjoukset

    Looking for a Skilled Software Engineer for Collaboration on Remote Projects Hello everyone, I’m looking for a strong software engineer to collaborate with on software development projects for U.S.-based clients. This is a long-term collaboration opportunity where we can work together on technical development, system design, and project delivery for remote clients. I’m looking for someone with solid software engineering fundamentals, strong problem-solving skills, and clear communication abilities. Requirements The ideal candidate should: • Have strong knowledge of computer science fundamentals • Be comfortable with data structures, algorithms, and clean coding practices • Be able to explain technical concepts clearly in English • Be confident in tech...

    €29 / hr Average bid
    €29 / hr Keskimäär. tarjous
    202 tarjoukset

    I want to launch a streamlined mobile app that lets users earn real money by completing surveys and watching ads. The flow is straightforward: a new user lands on the splash screen, signs up through phone-number verification, and immediately sees a clean dashboard showing available surveys and ad-view offers. As they complete each task, their wallet balance should update in real time. Key features I need built: • Phone-number verification sign-up (OTP based) • Task feed for surveys and rewarded-video ads • In-app wallet with live balance updates • Transaction history so users can track earnings • Simple withdrawal request form (API-ready so I can connect my payout partner later) • Basic admin panel where I can upload survey links, set ad campaigns...

    €3 / hr Average bid
    €3 / hr Keskimäär. tarjous
    40 tarjoukset
    Fast, Secure Website Development
    5 päivää left
    Varmennettu

    I’m ready to kick off a new website project and want it executed to the same standards I keep for my own work—fast load times, airtight security, and a seamless user experience across modern browsers and devices. Here’s what matters to me: • Performance: clean, lightweight code and smart asset optimisation so pages render instantly. • Security: industry-standard hardening (HTTPS, secure headers, sanitised inputs, up-to-date dependencies). • UX/UI polish: responsive layouts, accessible navigation, and intuitive flows that feel just as smooth on mobile as on desktop. I’ll supply brand assets, wireframes, and content; you’ll handle the build, integrations, and final deployment. The finished site should be easy for non-tech users to upda...

    €394 Average bid
    €394 Keskimäär. tarjous
    296 tarjoukset

    I’m working on a project using the AVR-IoT Cellular Mini (Sequans Monarch 2 modem) where I customized the Arduino-based firmware myself to periodically send GPS latitude and longitude data to my backend (BE) over HTTPS. The goal is to push GPS data (lat/long + timestamp) to a REST API endpoint within a specific time interval and verify that the data is successfully received and visible on the backend. However, I’m currently blocked by a TLS issue when trying to configure the CA certificate for HTTPS. When I attempt to add the root CA certificate (ISRG Root X1 – Let’s Encrypt) into the device/modem, I receive an error stating: “CA certificate input too long” Because of this: The TLS handshake fails. The HTTPS request does not complete. The endpoint i...

    €14 Average bid
    €14 Keskimäär. tarjous
    7 tarjoukset

    My real-estate " " website needs a quick but thorough tidy-up. The current CSS causes layout problems, styling inconsistencies, and several responsive design glitches that become obvious on tablets and smaller phones. In parallel, the property search bar has stopped filtering by price, bedrooms, and location, so visitors often get zero or the wrong results. The website layout on the product banner should be like realtor.com. The backend admin is not working and cannot log in While reviewing the code, I also noticed that some listings show incorrect information, others render with a poor visual presentation, and a few disappear altogether. Those issues likely share a template or query root, so tackling them alongside the search repair should keep the work contained. Here is wh...

    €163 Average bid
    €163 Keskimäär. tarjous
    214 tarjoukset
    VB.NET Shift Timing Update -- 2
    5 päivää left
    Varmennettu

    My donation-counter application (VB.NET, ASP.NET, SQL Server) currently treats the day as four 6-hour shifts. I need the underlying logic switched to three 8-hour shifts—nothing else about the feature set is changing and the screens can stay exactly as they are. Core work • Rework the scheduling code so every function that references shift boundaries now recognises 00:00-07:59, 08:00-15:59 and 16:00-23:59 (or equivalent server-time logic). • Update the existing SQL reports and any stored procedures that aggregate by shift so their totals align with the new 8-hour blocks. Acceptance I’ll verify by running a full day’s test data: the counters must roll over at the new cut-off times and all daily/shift reports must balance against those timestamps. This ...

    €71 Average bid
    €71 Keskimäär. tarjous
    19 tarjoukset

    Project Description We need a cloud-based reporter live streaming and footage upload platform. The system must allow reporters to go live from smartphones and interact with studio anchors, and also upload news footage 24×7. Studio receives reporter feeds in vMix or OBS Studio. The system must support 50 reporters and 5 video editors. Deployment timeline is 7 days. --- Core Requirements 1. Low-Latency Live Reporter Streaming • Smartphone streaming via WebRTC or SRT • Support 20 concurrent live reporters • Target latency < 2 seconds • Output feed compatible with vMix / OBS (RTMP or SRT ingest) Preferred media servers: • OvenMediaEngine • Ant Media Server --- 2. Reporter Portal (Mobile Friendly) Reporters login via web interface and can: ...

    €219 Average bid
    €219 Keskimäär. tarjous
    22 tarjoukset
    Armbrella AWS Back-End Optimization
    5 päivää left
    Varmennettu

    Project: Armbrella – Fitness & Wellness Social Platform Armbrella is a mobile platform focused on fitness and wellness that combines health tracking tools, social media features, free wellness video content, and a professional search engine for users to connect with trainers and wellness professionals. The platform was originally built using AWS Lambda, but due to performance and stability issues the app launch was delayed. We are now looking for an experienced developer to review the current architecture and migrate the backend to AWS EC2 (or recommend the best AWS architecture) to ensure the platform runs fast, stable, and bug-free before launch. Key Responsibilities • Review the existing codebase and AWS infrastructure • Migrate backend services from AWS Lambda ...

    €436 Average bid
    €436 Keskimäär. tarjous
    135 tarjoukset

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