Worked on the facebookresearch/faiss repository, focusing on enhancing robustness and reliability over a two-month period. Addressed memory safety and concurrency issues in C++ by implementing null-pointer protection in memory allocation routines and resolving race conditions in temporary file handling during concurrent test runs. Improved the stability of on-disk and in-memory structures, reducing crash risk and nondeterministic failures in stress tests. Additionally, stabilized the continuous integration pipeline by removing a flaky out-of-memory exception test written in Python, ensuring more consistent test results across platforms. Demonstrated strengths in bug fixing, memory management, CI/CD, and test automation throughout the engagement.