Engineering · Full-time · Roppongi Hills Mori Tower, Minato-ku, Tokyo. Full-time on-site at our Roppongi office. Working hours are fully flexible, but some meetings require attendance, such as the daily 7:30 a.m. team meeting. Partial remote work can be discussed for childcare or family-care needs.
Senior Backend Engineer
Build the reliable backbone behind the product and the agent — on your own call.
- Go
- TypeScript
- AWS
- PostgreSQL
- API
What you'll do
- Design, build, and operate backends / APIs
- Data modeling and infrastructure design (AWS)
- Designing the agent execution platform and external integrations
- Ensuring reliability, monitoring, and security
Must-haves
- 3+ years of server-side development
- Hands-on Go or TypeScript, plus cloud operations experience
- Experience leading schema / API design
- A track record of going further than most people would, and the ability to explain the circumstances and your own decisions concretely (any field)
- Experience seeing something through in an unreasonable situation, or breaking through after being turned down repeatedly
- Experience building trust single-handedly with a first-time client or a senior counterpart on site
- Experience owning one client or project end to end as the person responsible
- Concrete examples of building tools or automation to spare yourself repetitive work, of fixing slowness or defects you could not leave alone, and of producing work you are proud to show others
Nice to have
- Startup / 0→1 experience
- Experience with data platforms and event-driven architecture
Our strengths
- Industry focus — all-in on shipbuilding, compounding deep domain knowledge
- AI-agent native — built for real-world adoption, not PoC theater
- Speed & flexibility — a startup's agility and execution
- Social impact — solving skill succession × shorter build times
Who we're looking for
- Thinks from first principles and grasps problems at their essence
- Frames their own questions and moves forward amid uncertainty
- Can commit long-term to maritime as social infrastructure
- Someone who has an episode in their life that most people would not go through. Any field.
- Someone who has seen things through in unreasonable situations, or broken through after being turned down repeatedly
- Someone who cannot leave repetitive chores, slowness, or work they are not proud of alone (the three virtues of a programmer)
Terms & employment
Full-time (3-month probation). Full flextime / remote OK. Location: Roppongi Hills Mori Tower, Minato-ku, Tokyo. Full-time on-site at our Roppongi office. Working hours are fully flexible, but some meetings require attendance, such as the daily 7:30 a.m. team meeting. Partial remote work can be discussed for childcare or family-care needs. (relocating near Ōmori in 2027). Stock options available.
Why this role
Because the team is small, you build the architectural core on your own judgment.
Let's just talk first.
We start with a casual chat, not a formal screening. Reach out if this role interests you.
Apply for this role
