Golang Backend Developer

I develop components of a distributed data synchronization system between the listings service and the search index for a marketplace. I implemented transactional-outbox-based listing change synchronization, where the listing update and event record are performed within one transaction and a separate worker updates the index. This reduced incidents involving stale listing data after edits or removals by 80% and ensured idempotent event handling during worker failures.

I corrected search-index mappings for approximately 15 listing fields, automated database migration execution with Goose, and reduced schema deployment time from 30 to 5 minutes. I also implemented parallel listing processing using errgroup with a concurrency limit of 20 goroutines, improving processing speed for a batch of 100,000 listings by four times, and added OpenTelemetry tracing for diagnosing latency in the outbox worker event-processing chain.

I developed backend functionality for a mobile application that recognizes meal ingredients and calculates calories and macronutrients. I built CRUD APIs with net/http, implemented JWT and OAuth 1/2 authentication, and created a calorie calculation service with result caching.

I added database migrations with Goose and Docker Compose for one-command local startup. After migrating away from Supabase, I reduced scanning time from 6 seconds to 2 seconds. I covered business logic with Testify and GoMock tests, including table-driven edge-case tests, and performed pull-request reviews for a three-developer team.