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Senior Full-Stack Engineer Needed – Greenfield SaaS ([login to view URL] + Express + MongoDB) I’m launching a greenfield SaaS platform that enables users to craft polished CVs and cover letters through a modern, intuitive builder. The stack is fixed: [login to view URL] (App Router) + [login to view URL] + MongoDB I’m looking for a senior-level engineer (or a proven small team) to own the system end-to-end — from architecture design to production deployment. This is not a prototype project. The goal is to build a scalable, monetizable SaaS foundation. What I’m Looking For Architecture & Code Quality Production-grade code following Clean Architecture principles Clear separation of concerns (domain, application, infrastructure layers) Extensible domain models that support future features Maintainable folder structure and documented decisions Performance & SEO Proper SSR/SSG strategy for crawlable public pages SEO-ready meta management Structured data implementation Sub-200 ms API response times (95th percentile target) Lighthouse scores above 90 (Core Web Vitals) Data & Monetization Readiness Thoughtful MongoDB schema design with efficient indexing Subscription-ready architecture (Stripe integration hooks) Support for future free tier monetized via Google AdSense Clean separation between free and premium features Security Standards OWASP-aligned implementation Secure JWT handling & refresh strategy Rate limiting & request validation Encrypted sensitive fields No high/critical vulnerabilities on final scan Automated tests covering critical flows Internationalization English-first implementation Architecture prepared for adding new locales without refactoring Proper RTL readiness strategy (for future languages) User Experience Smooth, performant UI Optimized rendering strategy Efficient API design Minimal client-side overhead Key Deliverables 1️⃣ Solution Architecture Document System design overview Folder structure Deployment plan Scaling strategy 2️⃣ Fully Responsive [login to view URL] Frontend Reusable component system Clean state management Optimized rendering 3️⃣ Express API Layer REST (or GraphQL if strongly justified) JWT authentication Role-based access control Stripe subscription integration 4️⃣ MongoDB Schema Scalable document structure Proper indexing Clean relations strategy 5️⃣ Admin Dashboard User management Subscription analytics SEO page management 6️⃣ CI/CD Pipeline GitHub Actions (or equivalent) Automated deployment to Vercel / AWS / Render (open to recommendation) 7️⃣ Test Coverage Unit tests Integration tests Basic E2E tests Clear README with full setup instructions Acceptance Criteria Public pages render without client-side JS for bots Structured data passes validation tests API 95th percentile latency < 200 ms (staging benchmark) No high/critical vulnerabilities in final security scan Full deployment reproducible from repository instructions
Projektin tunnus (ID): 40251967
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153 freelancerit tarjoavat keskimäärin $773 USD tätä projektia

Hi, With 8 years in full-stack development, I'm well-versed in all aspects of building a SaaS platform with the specified tech stack. Your emphasis on a clean code architecture aligns perfectly with my approach to development – I consider myself an evangelist for Clean Architecture principles and domain-driven design. I understand how important performance, SEO, and data monetization are for your SaaS platform's success. I’ve implemented proper server-side rendering and followed best practices to ensure faster API responses (with an impressive 95th percentile latency benchmark). My work will provide SEO-ready meta management, structured data implementation, and support future monetization strategies such as Google AdSense as well as subscription handling through Stripe. Don't hesitate to ask how I can provide you with this vision for your project from the initial Solution Architecture Document through to reliable delivery of a production-ready system - Let's connect!
$550 USD 15 päivässä
5,1
5,1

Hi, Our devs looked at your project, and we noticed a potential bottleneck in your system's architecture that could affect how it scales. Our backend lead has tackled similar challenges before, ensuring smooth and efficient growth. We previously delivered a large-scale e-commerce platform using React and Node.js, handling over a million users seamlessly. The system was built to be robust and flexible, aligning with your current requirements. I'll be your direct technical point of contact, and we'll set up a staging environment for you to test features before going live. What's your long-term vision for scaling this project? Let's explore how we can make that vision a reality.
$400 USD 7 päivässä
5,0
5,0

Hello Dear! I write to introduce myself. I'm Engineer Toriqul Islam. I was born and grew up in Bangladesh. I speak and write in English like native people. I am a B.S.C. Engineer of Computer Science & Engineering. I completed my graduation from Rajshahi University of Engineering & Technology ( RUET). I love to work on Web Design & Development project. Web Design & development: I am a full-stack web developer with more than 10 years of experience. My design Approach is Always Modern and simple, which attracts people towards it. I have built websites for a wide variety of industries. I have worked with a lot of companies and built astonishing websites. All Clients have good reviews about me. Client Satisfaction is my first Priority. Technologies We Use: Custom Websites Development Using ======>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap4 4. jQuery 5. JavaScript 6. Angular JS 7. React JS 8. Node JS 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .Net 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB What you'll get? • Fully Responsive Website on All Devices • Reusable Components • Quick response • Clean, tested and documented code • Completely met deadlines and requirements • Clear communication You are cordially welcome to discuss your project. Thank You! Best Regards, Toriqul Islam
$250 USD 5 päivässä
5,0
5,0

Nice to meet you , It is a pleasure to communicate with you. My name is Anthony Muñoz, I am the lead engineer for DSPro IT agency and I would like to offer you my professional services. I have more than 10 years of working as a Backend and Software developer, I have successfully completed numerous jobs similar to yours therefore, and after carefully reading the requirements of your project, I consider this job to be suitable to my area of knowledge and skills. I would love to work together to make this project a reality. I greatly appreciate the time provided and I remain pending for any questions or comments. Feel free to contact me. Greetings
$1 018 USD 7 päivässä
4,2
4,2

Hello, Regarding your project, I notice that many overlook the intricacies of optimizing database queries for speed, which can bottleneck performance. My approach ensures efficient indexing and query optimization to deliver fast, reliable results. I've previously revamped a client's e-commerce platform, reducing their query response time by 60%, which significantly improved their user experience. I include 30 days of post-deployment bug-fixing, ensuring smooth operation. For your specific needs, what database system are you currently using? Let's discuss further.
$400 USD 7 päivässä
4,4
4,4

With a passion for crafting polished CVs and cover letters, I am excited to offer my expertise in launching your Greenfield SaaS platform. As a senior full-stack engineer with 5 years of experience, I have successfully executed similar projects offsite. I specialize in building seamless, scalable, and user-friendly systems that prioritize clean code and high performance. I understand the importance of architecture design, clean code, and performance optimization in creating a sustainable SaaS foundation. My approach emphasizes quality, maintainability, and future-proofing to ensure a reliable and efficient solution. Let's discuss how I can contribute to the success of your project with a focus on quality and performance. Chirag Pipal Regards
$550 USD 7 päivässä
3,8
3,8

Hi, SaaS CV Builder Platform"", We provide complete frontend to backend development with clean, scalable, and high-performance solutions tailored to your requirements. Our experienced team ensures modern UI/UX, secure architecture, smooth functionality, and full support until successful deployment. Let’s build a reliable and impactful product together. Regards, Muhammad Abdullah
$1 000 USD 14 päivässä
2,5
2,5

Hey , Good afternoon! I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams. I’m offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery. I have rich experienced in API Development, Node.js, NoSQL Couch & Mongo, MongoDB, Full Stack Development, Architecture, AngularJS, Amazon Web Services, SaaS and Next.js. For more information about me, please refer to my portfolios. I’m ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details.. Thanks for giving opportunity
$555 USD 4 päivässä
2,0
2,0

Hello, hope all is good. I am project manager of software agency. we have many years of development experience in Node.js, Full Stack Development, API Development and I have completed similar projects. Visit our website and check our work style and team members If this sounds good, have a meeting to discuss about your project in detail. Looking forward, Jayabrata Bhaduri
$500 USD 7 päivässä
2,0
2,0

Hello, I hope you are doing well. I understand that you are looking to build a SAAS BASED CV BUILDER PLATFORM and I would be happy to help. I have extensive experience in designing and developing Application and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.
$250 USD 7 päivässä
4,3
4,3

“If you want this done properly, this is the proposal to read.” I understand your need for a clean, professional, and user-friendly platform with seamless integration. I have worked on similar projects offsite and have experience of 5 years! My solution will ensure a scalable and monetizable SaaS foundation in line with your goals. I’d love to chat about your project. Worst case, you get free advice that can guide your project. Kind regards, Giancarlo
$550 USD 14 päivässä
0,0
0,0

I'm Aashu, a seasoned software engineer and tester well-versed in your listed stack and the additional relevant frameworks including Node.js. Throughout my career, I have consistently adhered to Clean Architecture principles and best practices, emphasizing on highly maintainable codebases with clear separation of concerns at multiple layers. My portfolio offers testimonies of scalable solutions, irrespective of the size or type of applications. Talking specifically about your requirement, my skillset is bang-on. From solid MongoDB schema design incorporating efficient indexing to creating a CI/CD pipeline on GitHub Actions, I'm capable of handling it all. Optimizing for performance and SEO, securing sensitive data using OWASP standards- are all fields where I have excelled over my professional journey. I have also transitioned from individual roles to leading a team wherein I designed and implemented optimal automation strategies from scratch for both web and mobile applications. With these experiences in managing scalable test suite frameworks, you can rest assured of your SaaS platform's robustness before going-live.I advertise dedication and commitment to each project I undertake and with our shared vision for a scalable, devote process intend to do the same
$500 USD 7 päivässä
0,0
0,0

I understand the significance of building a robust architecture that adheres to Clean Architecture principles and maintains an organized separation between domains, applications, and infrastructure layers. Performance and SEO are key components of any successful application, and I assure you that your platform will be no exception. My comprehensive approach includes ensuring proper SSR/SSG strategies for crawlable public pages, SEO-ready meta management, structured data implementation, and maintaining API response times below 200ms - all geared towards boosting your Lighthouse scores above 90 (Core Web Vitals). Additionally, guaranteeing a secure environment for your users is my top priority. I am skilled in OWASP-aligned implementations, secure JWT handling & refresh strategy, rate limiting & request validation, and encrypting sensitive fields all aimed at safeguarding your platform from potential threats. Using my past project Satocci as an example (referencing links), you can rest assured knowing that we will successfully meet each of the deliverables you've outlined. Let's unite my technical skills and unwavering commitment to work together on this exciting endeavour!
$600 USD 7 päivässä
0,0
0,0

Hello, I am Chintan, an experienced API Developer with over 8 years of expertise in developing robust and efficient API solutions. I have thoroughly reviewed your project requirement for the SaaS CV Builder Platform and I am confident in my ability to deliver a high-quality solution. I understand the importance of owning the system end-to-end, from architecture design to production deployment, and I am committed to providing a scalable and monetizable SaaS foundation as per your specifications. I will ensure that the architecture and code quality meet the highest standards, with a focus on performance, security, and user experience. Effective communication is key to project success, and I am excited about the opportunity to work on this project and collaborate closely with you throughout the process. I look forward to hearing from you to discuss the project further. Thanks, Chintan
$250 USD 7 päivässä
0,0
0,0

Hey! Building a cv builder means balancing seo for public pages with a snappy editor, i've handled this exact trade off before. you want clean architecture to avoid technical debt later so the app stays fast even as you scale features. Relevant Work i've done: legacy system modernization, transformed monoliths into high performance express services with jwt security real estate management system, built complex property filters and responsive dashboards with nextjs i'll ensure your api hits that sub 200ms target and keep the mongodb schemas clean for future stripe integration. let's have a short quick call about your priorities and get this demo ready.
$700 USD 7 päivässä
0,0
0,0

As a seasoned Senior Web & Mobile Application Developer, I bring a wealth of experience essential for the success of your greenfield SaaS project. With over a decade in the industry, I have specialized in MERN/MEAN Stack architecture and integrations which perfectly aligns with the stack requirements you've listed. My track record of delivering production-grade code following Clean Architecture principles, ensuring clear separation of concerns, extensible models, and maintainable folder structure maps perfectly to what you desire. Performance and SEO are crucial for attracting and retaining users. I'm adept at implementing a proper SSR/SSG strategy for crawlable public pages, SEO-ready meta management, structured data implementation as well as significantly improving API response times utilizin. With Regards!
$750 USD 7 päivässä
0,0
0,0

Jeddah, Saudi Arabia
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