Rajesh R.

Senior Full Stack Developer | MERN Developer | React | Node | Python

It's been 10+ years working as a Full Stack Developer React Node (MERN Developer), specializing in React.js, Node.js, and Express.js, building SaaS platforms, MVPs, AI-powered apps, and enterprise web applications. 15+ years as a .NET Developer, past and current, giving me a rare depth in enterprise architecture that most React/Node developers don't have. $90K+ earned and 47 projects delivered on Upwork as a React MERN Developer and SaaS Developer, with a 100% Job Success Score and Top Rated status. 50+ SaaS platforms shipped as a Senior React MERN Developer, including multi-tenant architecture, subscription billing, and role-based access systems. 1,178+ hours delivered across full stack builds from early-stage MVP to production SaaS platform as a Full Stack Developer React Node. 700+ enterprise clients migrated from legacy .NET systems to modern React/Node.js stacks, drawing on 15+ years of .NET depth alongside 8 years of hands-on MERN/React/Node delivery. PhD in Computer Science, 14,000+ StackOverflow reputation, and an active GitHub presence since 2014 engineering rigor behind every SaaS Developer engagement. WHERE I DELIVER As a React Developer, component architecture, dashboard builds, and responsive UI for SaaS platforms and enterprise web apps, with 500+ production launches. As a MERN Developer, REST APIs, backend architecture, MongoDB database design, and secure, scalable systems as a Full Stack Developer React Node. As a React MERN Developer end-to-end SaaS builds from data architecture to polished frontend, including a UK fintech SaaS platform (account management, compliance, CRM, and payment tooling). As a Senior React Developer, AI-powered web application productionization, including auth, backend, AWS deployment, rate limiting, and monitoring for a live product. As a SaaS Developer, multi-tenant applications, workflow automation, and third-party API/payment integrations across healthcare, fintech, and logistics domains. As a .NET Developer with 15+ years of enterprise depth legacy system modernization and .NET-to-Node/React migration for teams replatforming older applications, backed by 8 years of hands-on MERN delivery on the other side of the migration. INDUSTRY IMPACT FinTech / SaaS: Built a UK-based fintech SaaS platform covering account and investment management, loan and insurance workflows, budgeting tools, compliance and fraud detection, and secure payments, as a React MERN Developer. Healthcare: I have worked on Medi Spack Platform, Medical Audit platform and Klinck Care as a React MERN Developer. E-Commerce / CRM: I have developed ShopisLive, 100000+ orders processed / 10000+ customers managed, as a Full Stack Developer React Node. AI-Powered Applications: EZPZ, AI SaaS Comission Platform, built with ChatGPT, Claude and Gemini AI Integrated and productionized on AWS as a Senior React Developer. Enterprise / .NET Modernization: 15+ years working across .NET systems, including Soley Cleaning, Solar4Goods, Cosmicfinite, now applied to migrating legacy platforms into modern React/Node architectures. HOW I BUILD - As a React Developer: React, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, responsive design, component-driven architecture. - As a MERN Developer: MongoDB, Express, React, Node.js, REST APIs, Redis. - As a SaaS Developer: multi-tenant architecture, subscription billing, Stripe/payment integration, Docker, AWS, CI/CD, Git. - As a .NET Developer (15+ years, past and current): C#, ASP.NET Core, Entity Framework, SQL Server, the enterprise foundation behind every migration and architecture decisions I make on the MERN side.