Tencent
Distributed Database Engineering Intern · Qingyun Program
Distributed Database R&D Center
Contributed to a production analytical database, with work spanning distributed SQL execution, observability, and compute-node reliability.
- Extended an MPP execution engine with two-stage aggregation and distributed-plan support for complex subqueries; resolved intermediate- state merging, data redistribution, and cross-node semantic-consistency issues.
- Built a distributed query-profiling path that connects frontend, planner/optimizer, and worker metrics into query, operator, node, and thread views; added operator-boundary inspection for complex-plan debugging.
- Identified lock contention caused by high-frequency instrumentation in a large analytical benchmark and moved collection to operator boundaries to keep diagnostic overhead under control.
- Contributed to compute-node lifecycle and fault recovery across registration, heartbeats, versioned state convergence, distributed locking, query retry, and integration testing.
Hangzhou Higgs Investment Management Co., Ltd.
Full-Stack Strategy Engineer
Developed market-data infrastructure and internal analysis tools for quantitative research and live-trading operations.
- Built high-frequency market-data storage and real-time subscription pipelines with C++/Python, SQLite, and TDengine, supporting concurrent access from multiple threads and processes.
- Integrated brokerage market-data APIs and delivered trading-monitoring and live-parameter query tools for research and operational workflows.
- Prototyped a local document and natural-language SQL assistant with LightRAG, Vanna AI, DeepSeek, and Streamlit for internal troubleshooting.