Manmohan Y.

I build, improve, and take ownership of production web and SaaS applications using React, Next.js, Node.js, TypeScript, and PostgreSQL — from new products to complex existing platforms. Top Rated Plus | 100% Job Success | $100K+ earned on Upwork | 60+ Upwork projects I work with startups and established teams that need a senior developer who can understand an existing product, make sound technical decisions, and take ownership through development, deployment, and ongoing support. I can help with: • React / Next.js / TypeScript development • Node.js backend development and APIs • Existing codebase takeover and stabilization • SaaS platforms, dashboards and admin portals • PostgreSQL, Supabase, MongoDB and Firebase • Authentication, permissions and multi-user systems • Stripe payments, subscriptions and webhooks • Third-party API integrations and automation • AI integrations with OpenAI and Claude • Performance, debugging and production deployment My recent work includes analytics platforms, multi-user marketplaces, healthcare and research systems, operational dashboards, workflow automation, and data-heavy SaaS products. I’m comfortable building from scratch or joining an established application, learning the architecture quickly, fixing what needs improvement, and staying involved long term. Core stack: React, Next.js, TypeScript, Node.js, Express, PostgreSQL, Supabase, MongoDB, Firebase, Stripe, Tailwind, AWS, Vercel. If you need a senior full-stack developer to build, improve, or take over an existing product, send me a message.