Zakir contributed to the apache/kvrocks repository by developing enhancements for Redis SortedInt persistence and serialization. He implemented DUMP support for the SortedInt type, enabling data to be serialized as an RDB Set and improving compatibility with Redis protocols. Using C++ and Go, Zakir introduced deterministic retrieval through RangeByValue, which aids in data migrations and tooling. He also refined RESTORE semantics to ensure that restored data maintains integrity and matches Redis-like behavior. The work was validated through manual testing and collaborative development, demonstrating a solid understanding of backend development and data durability within distributed systems, though limited in project breadth.