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Hongxi Chen
Intern Software Engineer specializing in distributed systems and backend infrastructure
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About
Backend engineer with deep experience building event-driven logistics systems (orders, warehouse execution, real-time delivery tracking) using Spring Boot/PostgreSQL/Redis and strong observability (Prometheus/Grafana). Led a zero-downtime migration from monolithic MySQL to a sharded architecture for ~2M users with dual-write, checksum validation, and fast auto-rollback, and has strong security expertise including PostgreSQL RLS for multi-tenant SaaS and robust OAuth/JWT handling.
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Key Strengths
- Designed event-driven logistics backend (orders/warehouse/real-time tracking) with low-latency APIs and reliable async processing
- Resolved lost/duplicated message issues using transactional outbox + idempotent consumers with retries/deduplication
- Built strong observability for distributed systems using Prometheus metrics and Grafana dashboards
- Handled OAuth/JWT token refresh race conditions using single-use refresh tokens, Redis blacklist, and refresh deduplication
- Led zero-downtime migration from monolithic MySQL to sharded architecture for ~2M users using dual-write, checksum validation, and automated rollback
- Implemented multi-tenant security with PostgreSQL RLS + JWT role claims; prevented cross-org data leaks even when application logic failed
- Proactively identified payment webhook race condition causing ~5% misclassified payments; fixed with idempotent updates and DB constraints to prevent revenue loss
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