Developed an enhancement for the facebook/fbthrift repository by implementing efficient 64-bit varint encoding for data serialization. This work introduced a new C++ function that writes 64-bit integers as varints, reducing payload sizes and improving throughput for high-volume data transmissions. The approach focused on optimizing serialization efficiency, enabling lower bandwidth usage and better CPU performance in distributed systems. Emphasis was placed on code quality and maintainability, laying the foundation for future serialization improvements. The project leveraged expertise in C++ development, data serialization, and system programming, with all efforts during the period dedicated to feature delivery rather than bug fixes.