At Halo Lab, I built a Stripe premium checkout for an AI learning product, including safe handling of repeated and out-of-order webhooks. I added tests for the checkout flows.
I also implemented role-based permissions across APIs, React screens, and background workers. To improve WebSocket reliability, I added a heartbeat check and regression tests.
At Red Rocket Software, I built core NestJS and TypeORM backend services for a ride-hailing platform. I implemented live location tracking and moved ride-matching and payment workflows to BullMQ background jobs.
At Mocoding, I improved PostgreSQL queries and built Elasticsearch full-text search with fuzzy matching and relevance ranking. I also added Jest and Playwright tests and built a React/Redux admin panel.
