Karthikeyan B.

I build production Next.js and Node.js products, and add AI features that work in real apps. Recent wins: - Collinson Group (UK): architected a greenfield AI manuals app on Next.js and Node.js, 50,000+ users, 99.9% uptime - Built a Claude API streaming pipeline (SSE, partial-JSON parsing) and a PR review tool with the Vercel AI SDK and Gemini - Kurt Geiger (UK): migrated a flagship e-commerce platform from Magento to Next.js, 5,000+ daily orders What I help with: - Adding AI features to existing Next.js and React apps (chat, summaries, document Q&A) - Streaming LLM responses, prompt and error handling, cost control - Architecture and performance for Next.js apps (App Router, caching, Core Web Vitals) Stack: Next.js, React, TypeScript, Node.js, Express, PostgreSQL, Supabase, MongoDB, GraphQL, Docker, AWS, Stripe. Remote, EST/GMT overlap available.