Rajat C.

Full Stack Developer | MERN Developer | React Developer | Next.js Developer | Lovable Developer | Replit Expert I specialize in turning ideas and half-finished React and Next.js projects into polished, production-ready products built to perform reliably with real users. With 50+ projects delivered and $200K+ earned on Upwork, I bring proven experience across the full development lifecycle. I specialize in AI-Assisted Development using Replit and Lovable to rapidly build and launch modern, production-ready web applications. As a Replit Expert and Lovable Developer, I turn ideas, designs, and existing applications into scalable solutions using AI-powered workflows, covering frontend, backend, APIs, databases, integrations, debugging, and ongoing improvements. Most work reaches me in one of three states: → A prototype that demos well and breaks in production. Built in Replit, Lovable, Bolt, Cursor, or v0. The UI is there; auth is leaky, the database has no migrations, secrets are in the client bundle, and nothing is tested. I take it from "impressive demo" to something you can charge money for. → A live product that's gotten slow or fragile. Ballooning bundle sizes, N+1 queries, a dashboard that takes nine seconds to paint. I profile first, fix the actual bottleneck, and leave you with the measurements. → A blank repo and a deadline. MVP from scratch, architected so version two doesn't require a rewrite. In recent years, I have also helped clients turn AI-generated prototypes created with tools such as Replit, Lovable, Bolt.new, and Cursor into production-ready applications. This often involves restructuring code, improving security, fixing deployment issues, integrating payments and third-party services, and preparing applications for real users. ## Full Stack Web Development Frontend: React, Next.js (App Router, SSR/SSG/ISR), TypeScript, Tailwind Backend: Node.js, Express, [Python/FastAPI], REST + GraphQL Data: PostgreSQL, MongoDB, Supabase, Prisma, Redis Infra: AWS, Vercel, Docker, CI/CD AI-Assisted Tools: Claude Code, Replit, Lovable, Cursor, V0, Bolt etc. ## SaaS Product Development * Multi-tenant SaaS platforms * Admin dashboards and analytics panels * Authentication and role-based access * Subscription and billing workflows * Business process automation features ## API & Third-Party Integrations * REST API design and development * Payment gateway integration * CRM, ERP, and external service integrations * Webhooks and background job processing ## Performance & Scalability I focus on delivering applications that remain reliable as usage grows: * Server-side rendering and static generation * Code splitting and lazy loading * Query optimization and caching * Bundle size reduction * Production performance tuning If you're looking for a Full Stack Developer, React Developer, MERN Stack Developer, Replit Expert, Lovable Developer or Full Stack AI Developer. I can contribute as a reliable technical partner from planning to production. 📩 Feel free to message me and discuss your project. I’d be happy to explore how I can help build or improve your product.