Sigit K.

Senior Full Stack Developer | React, Next.js, TypeScript | AI & SaaS

I build production-ready SaaS and AI-powered products with React, Next.js, TypeScript & Node.js that stay fast under real traffic and remain maintainable as your team grows. With 8+ years of experience shipping high-stakes web applications, I help founders and product teams turn complex requirements into clean, type-safe systems that actually scale in production. You need a full-stack engineer who delivers reliable architecture, not just features that “work on my machine.” That’s the work I do. ✅ What I deliver • High-performance React & Next.js applications (SSR/SSG, Core Web Vitals, SEO) • Type-safe TypeScript codebases with solid test coverage • Scalable backend APIs with Node.js, NestJS, Hono & GraphQL • AI/LLM features: RAG pipelines, chatbots, vector search, OpenAI integrations • SaaS foundations: authentication, subscriptions, dashboards, multi-tenant architecture • Production deployment with Docker, CI/CD, AWS & Cloudflare 📈 Recent proof • Improved Lighthouse performance score from 37 → 100 • Shipped multiple products end-to-end from architecture decisions to production launch • Built design systems and component libraries used across multi-team codebases • Delivered high-traffic applications with strong reliability and maintainability 🤝 How I work I scope realistically, communicate proactively across time zones, and explain architectural decisions in plain language so you always understand the trade-offs. 💬 Next step If you’re building a SaaS product, AI feature, or high-performance web application and want an engineer who treats your codebase like it has to last, send over the details. Happy to discuss the best approach before you commit.