Designs, builds and improves corporate networks, firewalls and wireless LAN; resolves incidents and coordinates with internal teams and partners. Requires enterprise-network experience.
About this role
Belong’s Product Engineering Lead spans backend/API and frontend for its B2C used-smartphone buying service, にこスマ買取. The service handles transactions from pricing through payment and connects with partners by API. The role starts with backend development and guides product-wide technical direction. Responsibilities span scalability and reliability, testing and observability, incident response, API boundaries across Go/gRPC and TypeScript/Next.js, and cross-team delivery. The lead also automates partner and pricing operations, applies generative AI to development and product features, and contributes through reviews and mentoring; people management may follow as the team grows. Required experience includes designing, developing and operating web applications, backend-centered with frontend coordination; making technical decisions and completing projects; designing and operating RDB tables; and running public-cloud services, especially serverless. Candidates must have led production-service reliability improvements, including incident response and recurrence prevention; actively use AI to produce code or documents efficiently; and have experience guiding, reviewing or educating engineers.
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