Worked on stability and security improvements in open-source C and C++ projects, focusing on memory management and data serialization. In the facebook/zstd repository, addressed a critical memory allocation path by introducing a NULL pointer check after custom allocator invocation, preventing crashes from failed allocations and enhancing overall robustness. For protocolbuffers/protobuf, fixed a potential integer overflow in MessageLite serialization by implementing explicit size accounting guards, mitigating risks of resource exhaustion and denial-of-service. Demonstrated careful attention to defensive programming and secure coding practices, leveraging expertise in C, C++ development, and software security to deliver targeted bug fixes that improved reliability in production environments.