Applications: candidates must already be in Japan. Visa sponsorship: not available. Japanese: Not required. English: Business level. Japan Dev tags: Engineering, Web / Full-stack, Security, Java, Go, Kotlin, Ruby, React, Typescript, Rails.
Treasure Data:
At Treasure Data, we’re on a mission to radically simplify how companies use data and AI to create connected customer experiences. Our intelligent customer data platform (CDP) drives revenue growth and operational efficiency across the enterprise. Recognized as a Leader in The Forrester Wave™: Customer Data Platforms, we are advancing the industry with cutting-edge AI and real-time capabilities.
Your Role
We are looking for a Staff Fullstack Engineer to join our high-performing team in Tokyo. This is a pivotal role where you will act as a technical anchor, driving the direction of our AI-native systems at the intersection of Realtime and Personalization products.
You will be a hands-on individual contributor with the architectural vision to design and mentor across the full stack. Working in a squad-based model, you will collaborate with product managers and designers to ship features that help global customers generate tangible value from their data.
What You Will Do
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Technical Architecture: Drive end-to-end architecture, making high-stakes decisions that balance delivery speed with long-term maintainability.
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Fullstack Leadership: Ensure the squad is unblocked across both frontend (React) and backend systems, providing deep design guidance.
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Strategic Partnership: Partner with PMs and EMs to break down complex requirements into executable tasks, often serving as a Tech Lead.
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Mentorship: Elevate the engineers around you by modeling best practices in code review, design patterns, and operational excellence.
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Operational Excellence: Build for scalability and security, treating production operations and on-call rotations as first-class citizens.
About You
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Experience: 8+ years of software engineering experience with a track record of shipping complex products.
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Backend Depth: Proficient in Ruby, Go, Java, or Kotlin. Expertise in API scalability, database design, and distributed systems.
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Frontend Vision: Strong architectural knowledge of the React ecosystem, building modular and testable interfaces.
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Communication: Business-level English proficiency to explain complex technical concepts to non-technical stakeholders.
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Mindset: You thrive in agile environments and act as a "driver" to identify and remove blockers.
Preferred Qualifications
- Experience integrating Generative AI/LLM solutions and agents into production workflows.
- Experience with Ruby on Rails is a significant plus.
- Experience working in global teams and coordinating across time zones.
Tech Stack & Tools
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Backend: Ruby on Rails, Java, Kotlin, Go
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Frontend: React, TypeScript
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AI: Agent Foundry, AI Decisioning, LLM Integration
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Infrastructure: AWS, Distributed Systems
Work Environment & Benefits
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Hybrid Model: 3 days per week at the Treasure Data Tokyo Office.
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Growth: Opportunities for technical leadership and introducing new processes.
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Culture: An inclusive culture (DEI&B) that encourages growth, ownership, and unique innovation.