Mayur B.

I’m a Senior Full-Stack Developer with 11+ years of experience building, improving, and maintaining production web, SaaS, and mobile applications. My strongest technologies are React, Next.js, TypeScript, Node.js, NestJS, PostgreSQL, MongoDB, React Native, REST APIs, and GraphQL. I help startups, SaaS companies, agencies, and product teams build new applications, improve existing codebases, develop complex features, fix production issues, integrate APIs, optimize performance, and provide long-term product development. 🚀 𝐖𝐇𝐀𝐓 𝐈 𝐂𝐀𝐍 𝐇𝐄𝐋𝐏 𝐖𝐈𝐓𝐇 → Full-Stack Web Development → React & Next.js Development → TypeScript & JavaScript → Node.js, NestJS & Express.js Backend → SaaS Platforms & Dashboards → PostgreSQL & MongoDB → REST API & GraphQL Development → Authentication & Role-Based Access → Stripe & Payment Integrations → React Native & Expo Mobile Apps → Firebase & Supabase → AWS & Cloud Deployment → Existing Application Maintenance → Performance Optimization → OpenAI & AI Feature Integration ⚛️ 𝐅𝐑𝐎𝐍𝐓𝐄𝐍𝐃 𝐃𝐄𝐕𝐄𝐋𝐎𝐏𝐌𝐄𝐍𝐓 I build responsive, scalable interfaces using React, Next.js, TypeScript, JavaScript, Tailwind CSS, Material UI, Ant Design, Redux, and Zustand. I can convert Figma designs into production-ready applications, develop reusable component systems, build SaaS dashboards, integrate APIs and payments, implement authentication, and improve existing frontend architecture. ⚙️ 𝐁𝐀𝐂𝐊𝐄𝐍𝐃 & 𝐀𝐏𝐈 𝐃𝐄𝐕𝐄𝐋𝐎𝐏𝐌𝐄𝐍𝐓 I build and maintain backend systems using Node.js, NestJS, Express.js, PostgreSQL, MongoDB, Firebase, and Supabase. Backend work includes: • REST API and GraphQL development • Authentication and authorization • User roles and permissions • Database design and integrations • Stripe payments • Third-party API integrations • Business logic and workflows • Admin dashboards • SaaS backend services • Production debugging and optimization I also have experience with Laravel, FastAPI, Fastify, PHP, and Python when supporting existing full-stack applications. 🧩 𝐒𝐀𝐀𝐒 & 𝐅𝐔𝐋𝐋-𝐒𝐓𝐀𝐂𝐊 𝐏𝐑𝐎𝐃𝐔𝐂𝐓𝐒 I work across the complete product stack, from frontend UI to backend APIs, databases, integrations, deployment, and ongoing maintenance. My experience includes: • SaaS platforms • Marketplaces • Booking systems • eCommerce applications • Internal business tools • Admin dashboards • Job platforms • Payment-enabled applications • AI-powered applications • Existing product modernization 🔧 𝐄𝐗𝐈𝐒𝐓𝐈𝐍𝐆 𝐀𝐏𝐏 𝐒𝐔𝐏𝐏𝐎𝐑𝐓 Already have a React, Next.js, Node.js, or SaaS application? I can help with new features, production bugs, JavaScript-to-TypeScript migration, component refactoring, API problems, database issues, authentication, payments, responsive UI fixes, performance improvements, dependency upgrades, code cleanup, and deployment support. 📱 𝐌𝐎𝐁𝐈𝐋𝐄 𝐃𝐄𝐕𝐄𝐋𝐎𝐏𝐌𝐄𝐍𝐓 I also build and maintain cross-platform iOS and Android applications using React Native and Expo, including API integrations, authentication, state management, payments, and backend connectivity. 🤖 𝐀𝐈 𝐈𝐍𝐓𝐄𝐆𝐑𝐀𝐓𝐈𝐎𝐍 For SaaS and web applications, I can integrate OpenAI APIs, AI chat, assistants, and AI-powered product features into React, Next.js, and Node.js applications. 📊 𝐒𝐄𝐋𝐄𝐂𝐓𝐄𝐃 𝐏𝐑𝐎𝐉𝐄𝐂𝐓𝐒 • Fashion Marketplace – React Native + Node.js + GCP • React Website Completion – React + MongoDB + AWS • Mobile-to-Web Migration – improved UX and code readability • Lawttorney AI – Legal AI Platform • Climate Change Careers – Job Platform 🛠 𝐂𝐎𝐑𝐄 𝐓𝐄𝐂𝐇 𝐒𝐓𝐀𝐂𝐊 Frontend: React, Next.js, TypeScript, JavaScript, Tailwind CSS, Material UI, Ant Design, Redux, Zustand Backend: Node.js, NestJS, Express.js, Laravel, FastAPI, Fastify Database: PostgreSQL, MongoDB, Firebase, Supabase Mobile: React Native, Expo APIs: REST API, GraphQL, Stripe, OpenAI API Cloud: AWS, GCP Tools: Figma, Git, GitHub 🏆 𝐖𝐇𝐘 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐇𝐈𝐑𝐄 𝐌𝐄 • 11+ years of development experience • Top Rated on Upwork • 100% Job Success • $300K+ earned • 11,038+ Upwork hours • 53 jobs • Strong React, Next.js & full-stack experience • Experience with new and existing applications • Long-term production support • Strong communication and reliable delivery 💬 𝐇𝐎𝐖 𝐖𝐄 𝐒𝐓𝐀𝐑𝐓 Send me your requirements, Figma design, existing application, codebase details, or current technical problem. I’ll review it and recommend the best approach for frontend, backend, full-stack development, integrations, optimization, or long-term support. 𝐊𝐄𝐘𝐖𝐎𝐑𝐃𝐒 Full-Stack Developer | React Developer | Next.js Developer | TypeScript | Node.js | NestJS | React Native | SaaS Development | PostgreSQL | MongoDB | REST API | GraphQL | Firebase | AWS | OpenAI API