Worked on core security and reliability improvements across the 389ds/389-ds-base and python/cpython repositories, focusing on risk reduction and safer deployments. Addressed a buffer overflow vulnerability in C by adding explicit size checks and robust error handling to LDAP utility functions, enhancing both stability and security. In the python/cpython repository, resolved a multiprocessing bug by changing mutable default arguments to None, preventing unintended shared state between process instances. Leveraged expertise in C programming, Python, and buffer overflow prevention to deliver targeted bug fixes that improved code safety and reliability, supporting more dependable deployments and reducing the likelihood of production incidents.