Sahil K.

🚀 Senior full stack developer for SaaS products, web apps and AI features, built with React, Node.js, Python and PHP. 🏆 Top Rated | 100% Job Success | 5.0 on every contract | 7+ years building web apps Most projects I take on start in one of three places: ✅ A SaaS idea that needs a solid first version (MVP) ✅ A live app that's slow, buggy or needs new features without breaking what works ✅ A product that needs AI inside it: chatbots trained on your docs, AI features or workflow automation What makes me different: I've spent about 7 years on both sides of the work. I launch new SaaS MVPs from scratch, and I take over existing apps that are slow, buggy or hard to change, then clean them up and keep building. You get one developer who owns the frontend, backend, database and deployment, so nothing falls between the cracks. What I can build or fix for you: - SaaS MVPs: logins, roles and permissions, multi-tenancy, Stripe subscriptions, admin dashboards - App takeovers and bug fixing for React, Node.js, Python and Laravel codebases - AI integrations: chatbots trained on your documents (RAG), OpenAI, Claude and Gemini features, workflow automation - CRM, booking and LMS platforms built around how your business works - REST API integrations with Stripe, PayPal, Zoom, ERPNext and more Stack: JavaScript and TypeScript with React, Next.js and Vue, React Native for mobile, Node.js (Express, NestJS), Python (Django, FastAPI, Flask) and PHP/Laravel, with PostgreSQL or MySQL, deployed on AWS with Docker and CI/CD. Proof you can check: - Unjamm: a live flight compensation SaaS that pulls flight data from FlightAware and checks EU261, UK261 and APPR eligibility automatically - Knit: a multi-tenant CRM with workflow automation - AusGrant: a grants directory covering 4,300+ programs in 13 countries - TaxTrex.ai and R&D Tax Academy, localized for 7 countries - Here on Upwork: a dispute-resolution web app I worked on for 5 months, with three 5-star reviews How we start: tell me what you're building or what's broken. I'll ask a few questions and send a short written plan with milestones before any code is written. You get regular updates and a staging link to test as we go, and my hours overlap with US and UK time.