Worked on backend reliability and messaging continuity across two repositories, openclaw/openclaw and moltbot/moltbot, over a two-month period. In openclaw/openclaw, addressed a key bug in Feishu Group Chat by refining guard logic to preserve conversation context, ensuring messages with prior user context were processed correctly and improving group chat stability. In moltbot/moltbot, enhanced Telegram integration by reusing a sticky IPv4 dispatcher for health checks, which improved reliability in environments with broken IPv6 egress and reduced unnecessary log noise. Leveraged TypeScript, API integration, and network programming skills to deliver targeted, maintainable improvements focused on operational robustness and test coverage.