Agent Harness Engineer
Salary (published): ¥857,143–¥1,428,571 / month incl. 45h fixed overtime — approximately ¥10.29M–¥17.14M / year, plus stock options; negotiable by experience. Languages: Fluent Japanese or business-level English.
About the role
Build the control layer for AI-agent orchestration at JAPAN AI — the execution engines, SDKs, and guardrails that let enterprise AI agents run reliably in production.
Responsibilities
- Design and implement the control layer for AI-agent orchestration
- Build execution engines and SDKs
- Session management and recovery mechanisms
- Policy guardrails for agent behavior
- Model routing and inference optimization
Qualifications
- 5+ years of production backend engineering (Python)
- Distributed systems design
- RESTful APIs / gRPC
Nice to have
- Agent-framework experience
- Cloud platforms (AWS / GCP / Azure)
- RAG systems
- Go infrastructure development
Tech stack
Python, distributed systems, agent orchestration, model routing, LLM APIs.
External listing — the salary range is stated on the official posting (verified live 2026-07-30). The Apply button takes you to JAPAN AI’s official HRMOS page.
Working conditions
- Employer
- JAPAN AI
- Employer contact
- https://hrmos.co/pages/geniee
- Workplace
- Tokyo (Nishi-Shinjuku) · Hybrid (3 office / 2 remote)
- 工作型態
- Full-time
- 薪資
- ¥10.29M–¥17.14M / year (approx.)
These working conditions are summarized from the employer's official posting, where the full and authoritative conditions are published. Please confirm the final terms directly with the employer before accepting any offer.