sumit S.

Full-Stack Developer | React & Node.js | SaaS, APIs & Web Apps

Full-stack developer building production MERN and Next.js apps, with NestJS backends and REST APIs. Seven years shipping enterprise web applications in healthcare, POS, and payments, from requirements to production, not demos that work once. Here's what that looks like in practice: HEALTHCARE ENTERPRISE PORTALS Lead full-stack development on EMHware, a medical enterprise portal serving healthcare organizations at scale. React, TypeScript, Next.js, and Laravel, from requirements through production, with real gains in page load time and accessibility. POS, INVENTORY MANAGEMENT & PAYMENTS Built core features for BottlePOS, an enterprise point-of-sale platform for multi-location retail chains: inventory management, sales reporting, PAX terminal integration for in-store card payments, and Stripe. The parts that have to work every time, because money moves through them. CUSTOM PRODUCT CONFIGURATION & UI Built VarsityCart, a web platform with real-time, pixel-perfect product customization, letting customers apply and preview designs before buying. TECH STACK Frontend: React, Next.js, TypeScript, JavaScript (ES6+), Tailwind, Angular Backend: Node.js, NestJS, Express, Laravel, Core PHP, Python, REST & GraphQL APIs Data: MongoDB, PostgreSQL, MySQL, Redis Cloud & DevOps: AWS, GCP, Firebase, Docker, CI/CD, Vercel, Git Auth: OAuth 2.0, Okta, SSO, JWT I also build AI features into apps when a project calls for it: chatbots, document Q&A, and OpenAI-based workflows integrated into products that are already in production. If you've got a full-stack build, a legacy system that needs modernizing, or a payment integration to get right, send me a message and tell me what you're working on.