Senior Software Engineer - Ruby on Rails

Treasure AI Minato-ku, Tokyo May 20 2026
  • 💴 No salary range given
  • 🏡
    Partially remote
  • 🗾 Japan residents only
  • 💬
    No Japanese required
    Business English
  • 🧪
    Senior level
    Unspecified years of experience
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About Treasure AI

Treasure AI Minato-ku, Tokyo

Treasure AI is the only enterprise Customer Data Platform that harmonizes an organization’s data, insights, and engagement technology stacks to drive relevant, real-time customer experiences throughout the entire customer journey.

Key benefits

  • Highly Technical Founders
  • Globally distributed company
  • Open Source is in our DNA

About the position

As a Senior Software Engineer in the Composable Team, you will design, build, and ship features across our Ruby on Rails APIs and React (TypeScript) web application used by global enterprise customers. Working as part of a distributed team, you’ll collaborate closely with product managers, UX designers, QA testers, and fellow engineers to plan, iterate on, and deliver high-quality enhancements to our composable CDP offering.

Responsibilities

  • Participate in the team’s rotation to own the development process from discovery to release: break down desired outcomes into smaller work items, forecast timelines, implement, test, and iterate based on feedback.
  • Produce code that is easy for humans to understand and for AI assistants to modify.
  • Collaborate with cross-functional project stakeholders to clarify requirements, advocate for pragmatic trade-offs, and align on user experience and technical design.
  • Monitor and improve user-facing performance, minimize or prevent incidents, and increase operational efficiency through observability and automation.
  • Contribute to software engineering & process standards, documentation, and knowledge sharing.
  • Embody a culture of transparency, collaboration, and continuous learning to deliver customer value.

Requirements

  • Senior level professional software engineering experience building & maintaining web applications in a backend role.
  • Working understanding of the AWS cloud environment, infrastructure as code, and CI/CD practices.
  • Ability to clearly communicate through written methods, and proactively confirm whether your ideas are being correctly understood by your audience.
  • Flexibility in shifting working hours when needed for sporadic synchronous meetings in a team distributed across North America and Japan timezones.
  • Proficiency with Ruby on Rails, common API implementation patterns, and asynchronous background job processing.
  • Proficiency with data modeling in relational databases with standard SQL, and query performance optimization.
  • Ability to learn frontend development skills with support from the team up to a beginner level.
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Meet Treasure AI's Developers

David discusses how he enjoys switching hats between ML and software, and why he finds Treasure AI’s “extensive ecosystem” so much fun.

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Carlo, a Staff Software Engineer, shares how Treasure AI’s latest AI initiatives are opening up unprecedented opportunities for both the company, and his career.

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Tyler is a software engineer at Treasure AI working on their Data Clean Room product. He talks about how Treasure AI supports their team’s learning and growth, and how they invest in the quality and performance of their services.

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