Product Manager, AI SaaS

Role & Expectations

1. 1Systematize product requirements from business goals and customer challenges, and translate them into technical architecture
2. 2Lead the definition of feature boundaries, domain design, and API specifications
3. 3Make Build vs Buy vs Integrate technology selection decisions and guide optimal investment choices
4. 4Make trade-off decisions on non-functional requirements (availability, scalability, security, cost)
5. 5Determine the direction of the product itself through cross-functional collaboration with engineering teams, PdMs, and designers
6. 6Formulate roadmaps for visualizing and systematically resolving technical debt

Job Description

1. 1Product Requirements & Architecture Design: systematize product requirements, define feature boundaries, domain design, data contracts, and API specifications, operate RFC-driven design review, design products leveraging LLM / generative AI (RAG, tool-use, guardrails, etc.)
2. 2Technology Selection & Trade-off Decisions: Build vs Buy vs Integrate technology selection, design non-functional requirements (availability, scalability, security, cost) and make quality attribute trade-off decisions, formulate roadmaps for visualizing and systematically resolving technical debt
3. 3Cross-functional Collaboration & Roadmap: collaborate with engineering teams, PdMs, and designers, formulate and drive product roadmaps, visualize technical debt and plan systematic resolution

Why You'll Love This Role

1. 1Determine the direction of the product — decide not just individual features, but the 'what, why, and how' of the entire product. Design the future of JAPAN AI's 9 products.
2. 2At the intersection of technology and business — own the highest-impact decisions: translating business challenges into technical architecture.
3. 3Frontline of AI product design — tackle architecture design unique to AI products: RAG, tool-use, guardrails, multi-agent systems, and more.
4. 4Direct dialogue with leadership — engage directly with executive leadership and client CTOs/technical leads to formulate product strategy.
5. 5Technical debt resolution — formulate roadmaps for visualizing and systematically resolving technical debt, ensuring the long-term health of the product.
6. 6Rapid-growth environment — in a startup that has grown to 200+ people and 9 products in just 3 years, you will have significant autonomy in product decision-making.

Key Results (KR/Metrics)

1. 1Product roadmap achievement rate
2. 2Rework rate attributable to architecture reviews
3. 3New feature release cycle reduction
4. 4Product quality attributes

Team Structure

1. 1Approximately 120 members are part of the development organization.
2. 2The Product Manager collaborates closely with the following teams and stakeholders: Agentic Product Engineer — Agent feature development; Human-AI Collaboration Architect — Agent experience design; FDE (Field Development Engineer) — Customer requirements and feedback; Executive leadership — Business strategy and investment decisions

Learning & Development Support

1. 1AI Tool Usage Support: Company covers the cost of using AI tools such as JAPAN AI SaaS services, Cursor, ChatGPT, Claude, etc.
2. 2Development Tool Support: If a desired development tool is paid, the cost is covered (up to ¥30,000 per year)
3. 3Book Purchase Assistance: Company covers the cost of purchasing books for learning, such as technical books (up to ¥30,000 per half-year)
4. 4Language Learning / Qualification Support: Company covers the cost of Japanese or English learning programs and qualification acquisition
5. 5Refresh Allowance: Company covers the cost of services used for personal refreshment (up to ¥5,000 per month) e.g., gym, yoga, chiropractic, aquarium, movies, theme park tickets, etc.
6. 6Housing Allowance: Housing allowance provided for those living in designated areas (up to ¥30,000 per month)

応募資格（必須）

• 5+ years of practical experience as a Product Manager or Tech Lead
• Practical experience as a software engineer (at a level where you can understand the architecture of an entire product)
• Experience designing products that leverage LLM / generative AI (RAG, tool-use, guardrails, etc.)
• Deep understanding of system design (distributed systems, microservices, event-driven architectures)
• Experience in requirements definition and consensus-building with business stakeholders
• Language requirement (at least one): Japanese: Fluent — able to discuss product development without friction; English: Business level or above and Japanese proficiency (JLPT N2 or equivalent), or a minimum of one year of experience working in a Japanese-speaking environment.

歓迎する経験

• 0→1 launch experience for SaaS / B2B products
• Startup work experience
• Cloud architecture design (AWS / GCP / Azure)
• Experience operating RFC-driven design review processes
• Technical communication ability in English

待遇・福利厚生

• Refresh Allowance
• シャッフルランチ/ディナー
• 夏季休暇
• 年末年始休暇
• 年次有給休暇
• 従業員持株会
• 慶弔休暇
• 社会保険完備
• 資格取得・英語学習支援
• 部活動手当

求めるスキル・経験