This Main System Engineer role involves designing, implementing, and optimizing the entire system for console games. The responsibilities include managing memory, file I/O, and save data functionality, adapting to different platforms (PlayStation, Xbox, PC), integrating with SDKs and middleware, and utilizing performance analysis tools. The job also involves designing and operating core features for console and PC games, collaborating with teams, and a passion for game development. This role is based in either Osaka or Tokyo, Japan, with negotiable annual salary, including overtime pay. The role offers comprehensive benefits including health insurance, commuter allowance, and self-development support.