Shimizu developed an asynchronous engine encoding feature for the bytedance-iaas/sglang repository, introducing a non-blocking async_encode method to the Engine class using Python and asynchronous programming techniques. This addition improved encoding throughput and responsiveness, enabling more efficient resource utilization for services dependent on engine encoding. Shimizu ensured robust test coverage to maintain consistency between synchronous and asynchronous implementations, supporting maintainability and future async adoption. In the huggingface/accelerate repository, Shimizu addressed a documentation bug by correcting command-line arguments in the FSDP2 example README, enhancing onboarding and reproducibility. The work demonstrated careful attention to code quality, documentation, and collaborative development practices.