· Designed and implemented high-performance backend services using Java (Spring Boot, Netty) and C (POSIX, epoll, libuv).
· Built RESTful/gRPC APIs with efficient data serialization (Protobuf, JSON) and integrated with relational (PostgreSQL, MySQL) and NoSQL (Redis, MongoDB) databases.
· Optimized system throughput and latency through multi-threading, connection pooling, zero-copy, and memory management ©.
· Developed asynchronous, event-driven architectures; implemented message queues (Kafka, RabbitMQ) for decoupled processing.
· Ensured reliability with error handling, transaction management, and data consistency patterns (SAGA, outbox).
· Debugged performance bottlenecks using profiling tools (JProfiler, perf, Valgrind) and resolved memory leaks/race conditions.
· Collaborated cross-functionally in agile teams; wrote unit/integration tests (JUnit, CUnit, gTest) and API documentation.
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