Blockchain data and analytics.

• Cut API response times by 70% through query and architecture optimisation.
• Migrated analytical workloads from PostgreSQL to ClickHouse, achieving a 3x speedup on the affected paths.

TODO — one line on scope.

Decentralized peer-to-peer network infrastructure.

• Led development of the P2P networking layer in Rust (QUIC via Quinn) and Go, handling 10,000+ daily active nodes.
• Owned high-throughput distributed-systems design: connection management, backpressure, and reliability under churn.
• Worked directly with ecosystem partners, turning their requirements into concrete technical solutions and delivery plans.

TODO — one line on scope.

Licensed cryptocurrency exchange in Vietnam. Lead backend engineering for the CEX affiliate platform.

• Own the backend architecture of the affiliate platform: NestJS/TypeScript services, PostgreSQL, Redis, RabbitMQ, Zitadel IAM, with Go microservices for real-time paths.
• Designed and shipped a real-time WebSocket notification service in Go (sqlx, Redis Pub/Sub, JWT middleware) with a subscribe-before-backfill reconnection pattern to prevent missed events.
• Designed the event architecture on RabbitMQ: topic exchange, routing-key conventions, and dead-letter handling.
• Designed an i18n-safe notification schema (dot-notation keys, client-side rendering) and the accompanying migration.
• Built a polyglot shared-constants pipeline (NestJS + PHP) from a single JSON/YAML source to typed npm and Composer packages.
• Introduced black-box end-to-end API tests (Jest + Axios) against a staging environment; caught JOIN semantics and N+1 issues in code review.