Backend Developer (Contract) — Freelancer at Freelancer

Delivered production e-commerce platforms end to end using Node.js, TypeScript, and GraphQL (Yoga) with PostgreSQL (Drizzle ORM). Designed relational schemas and built CRUD resolvers and DB-indexed search/filtering. Integrated Stripe Checkout with secure webhook-driven fulfillment and automated status transitions. Implemented Clerk JWT authentication with role-based access control and ownership-protected mutations. Added Redis caching with TTL and mutation-triggered invalidation, and used Redis Pub/Sub with Socket.io for real-time features. Wrote E2E and integration tests (Playwright, Vitest, Supertest). Containerized services with Docker Compose and set up CI/CD deployments via Railway and GitHub Actions, including graceful shutdown.