Senior Software Engineer, Core System Team

Tokyodev is a software development firm that builds technology platforms and services. As a Senior Software Engineer on the Core System Team, you will be responsible for designing, developing, and maintaining the foundational components that power the company’s products. The role typically involves writing high‑quality, performant code for backend services, improving system reliability, and optimizing scalability. You will collaborate with product managers and other engineers to define architecture, conduct code reviews, and mentor junior team members. Daily tasks may include troubleshooting production issues, implementing new features in core libraries, and ensuring that system performance meets service‑level objectives. The position suits candidates with several years of experience in building large‑scale software systems, strong proficiency in languages such as Java, C++, Go or similar, and a solid understanding of distributed architectures, databases, and API design. Ideal applicants are self‑directed engineers who enjoy solving complex technical problems, leading technical discussions, and contributing to the overall health of a critical codebase.