Worked on stabilizing the Haxe C++ runtime by addressing a memory management issue in AtomicInt within the HaxeFoundation/haxe repository. Refactored AtomicInt to decouple garbage-collected memory from cpp.Pointer by introducing a private Data class, ensuring AtomicInt is no longer GC-managed. This technical approach reduced the risk of memory-related edge cases at the GC and C++ boundary, improving the reliability of atomic operations in multi-threaded environments. The work focused on low-level programming, memory management, and C++ integration, resulting in a more robust native interop layer and enhancing the stability of atomic operations for the Haxe C++ target.