At Tencent, I built C++ and Go backend services for a B2B network telephony platform serving enterprise customers, Tencent Meeting, and WebRTC-based scenarios. I implemented customer-specific SIP adaptations and added precondition negotiation to address call-compatibility issues.
I reimplemented the SIP gateway with C++ and Boost to add TLS support for integration with BT in the UK, while retaining UDP connectivity for existing operators. I also implemented configuration-center and admin-backend functionality, and used perf to investigate and resolve service performance issues.
Independently, I designed and developed Cosight, a real-time multimodal AI agent for mock interviews and screen understanding. Its Go-based Harness runtime orchestrates speech recognition, visual understanding, reasoning, and speech synthesis; the project runs end-to-end and is actively maintained.
