Lead the design, development, and operation of the internal operation system supporting the circulation of used devices.
About this role
Belong ('deliver the next value you can proudly show to those dear to you') builds a used-smart-device ecosystem, serving individual, corporate, and internal users with flexible in-house development. As a Senior Software Engineer you build scalable, highly available, robust web services, APIs, and data-analytics infrastructure: API development (Go/Python), web frontend (Next.js & TypeScript), integrated data-analytics foundation (BigQuery), HTTP/gRPC service integration, CloudSQL database design/operation, releases, operations, incident response and on-call, plus team building and coordination with management/product owners — for products like 'NicoSuma', its buyback, inventory/sales systems, and B2B SaaS. Full-time (seishain); Tokyo (Akasaka, Minato); ~2–3 office days/week.
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