Worked on the cloudflare/quiche repository to enhance the robustness of QUIC protocol packet handling in Rust. Addressed a critical issue by refining packet number length encoding, ensuring correct decoding under high packet loss in accordance with RFC 9000. The solution involved implementing conditional logic for longer packet number encoding when required and developing comprehensive tests to validate behavior across various network loss scenarios. This improvement reduces the risk of misinterpreted packet numbers and spurious retransmissions, thereby increasing connection reliability. Demonstrated expertise in network protocols, packet handling, and test-driven development, contributing to the overall stability and performance of the protocol stack.