Sujit Kumar

About

Full-stack developer who has built and shipped microservices, web apps, and mobile applications end-to-end (from initial implementation to production operations). Currently working on contract projects while building developer tooling and sharing engineering writing publicly.

Experience

• Software Developer — Contract & Development Work · Contract & Development Work06-01-2025

  – Built a link management system with URL shortening, deep links, campaign tracking, and real-time analytics — Go, Fiber, ClickHouse, PostgreSQL, Redis; redirect latency under 100ms – Developed a mobile-first service booking app with real-time queue management, WhatsApp-based auth, and payment gateway support — React Native, Node.js, Supabase, BullMQ, Paytm/PhonePe – Owned full-stack delivery across client projects: product catalogs, admin dashboards, and lead generation tools — architecture to deployment, no handoffs

• Software Developer · Viral Equation10-01-2024 – 06-01-2025

  – Designed and built a multi-service backend from scratch using Turborepo — separate services for users, events, payments, and notifications with clean inter-service boundaries – Reduced API response times by 20% by introducing proper indexing strategies and a Redis caching layer across hot endpoints – Deployed production infrastructure: Docker containers, NGINX reverse proxy with SSL, rate limiting, and locked-down security headers – Integrated Cashfree for payments, WhatsApp Business API for transactional messaging, AWS S3 for storage, and Cloudflare Tunnel for secure access – Set up Consul for service discovery, ICS calendar sync for event scheduling, and GitHub Actions for automated CI/CD pipelines

• Software Developer · IBharat05-01-2024 – 10-01-2024

  – Rebuilt the frontend of ibharat.org with Next.js — added a Google News-style explore section with SSR and category-based article filtering – Wrote custom scrapers and sitemap parsers that automatically pull and normalize articles from 50+ sources; built fallback handling for sites that frequently change structure – Designed the database schema with full-text search indexing so articles are instantly searchable across thousands of entries – Pushed Lighthouse performance score above 90 through SSR, lazy loading, image optimization, and aggressive caching – Built an admin dashboard for the editorial team to manage sources, review content, and manually override published articles

Education

• Kamla Nehru Institute of TechnologyMaster of Computer Applications, Computer Applications

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