Worked on python/cpython and picnixz/cpython repositories to enhance memory safety, import stability, and developer experience in multi-interpreter environments. Focused on C programming and Python internals, addressing memory leaks by refining reference counting in HAMT allocation failure paths and improving error handling to reliably raise MemoryError during allocation failures. Improved documentation clarity through targeted corrections in the C API docs, supporting both users and contributors. Hardened the import system by resolving issues with import lock management and error propagation, particularly when sharing memoryview objects across interpreters. Emphasized robust memory management and system programming to reduce risk and improve interpreter reliability.