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Si Chen

@sichen

I build high-performance distributed backend systems for fintech, e-commerce, and gaming at production scale.

I've built and owned backend systems at CMB YunChuang, JD.com, and Shangyoo Network, improving SMS delivery from 85% to 99% and supporting production services end to end.

At JD.com, I processed 10M+ messages per minute during Double 11 with sub-20ms API latency, built high-concurrency C++ systems, and improved a critical MySQL query from 10+ seconds to about 200ms.

Experience

Work history, roles, and key accomplishments

Software Development Engineer

CMB YunChuang Information Technology Co., Ltd

Jan 2023 - Feb 2026 (3 years 1 month)

● 85% → 99% SMS delivery success rate through protocol diagnosis, carrier-specific handling, and retry mechanisms.
● Built a Dockerized ELK pipeline with Filebeat, Logstash, and a 3-node Elasticsearch cluster, enabling near-real-time SMS analytics and anomaly-based monitoring.
● Extended Logstash's Ruby output plugin to execute Redis Lua scripts, correlating partial message records across distribu

Software Development Engineer

JD.COM

Nov 2019 - Mar 2022 (2 years 4 months)

● Built and independently owned backend services for real-time e-commerce data and user-profile scenarios, serving 50+ application use cases.
● Processed real-time traffic at peaks of 10M+ messages/minute during major promotions such as 618 and Double 11, with API latency under 20ms.
● Designed and implemented high-concurrency marketing and user-acquisition systems in C++, handling 5K–10K operatio

Server-Side Development Engineer

Shenzhen Shangyoo Network Technology Co., Ltd.

Jun 2016 - Jun 2019 (3 years)

● Designed and implemented multiple cross-server battle systems—including Legion War, Yidu Space, and Ladder Battle—supporting 500–800 concurrent players per battle with tier-based cross-server matchmaking.
● Built C++/Lua server-side gameplay systems within a multi-process MMO architecture spanning login services, 10 game-server processes, cross-server services, and database services.
● Diagnosed