Guu Jiang contributed to backend development in Rust, focusing on real-time communication and low-level performance optimization. In the zed-industries/livekit-rust-sdks repository, Guu Jiang implemented dynamic server-controlled muting for audio tracks, enabling real-time session management based on server instructions. They also exposed granular participant permissions to the FFI layer, allowing applications to enforce per-participant capabilities with protocol buffers. In cryspen/libcrux, Guu Jiang addressed AVX2 SIMD256Vector endianness issues by correcting byte order handling and expanding the test suite, improving cross-platform reliability. Their work demonstrated depth in Rust, protocol buffers, and testing, with careful attention to API stability and correctness.