This position is closed and is no longer accepting applications.

Software Engineer, Platform API - Ruby on Rails

Treasure AI Minato-ku, Tokyo October 29 2025
  • 💴 No salary range given
  • 🏡
    Partially remote
  • 🗾 Japan residents only
  • 💬
    No Japanese required
    Business English
  • 🧪
    Intermediate level
    2+ years experience required

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
Read more

About the position

Responsibilities

  • Build, expand, and improve the backend Ruby on Rails APIs.
  • Support technical design, specifications, and implementation of our product from an API perspective.
  • Collaborate with Frontend and Backend developers, ensuring compatibility between systems.
  • Make sure scalability, performance, and operationalization are always the main priorities during development.
  • Stay informed about new technical concepts that we should adopt and those we should ignore.
  • Along with the rest of the team, take ownership of and manage the services you built.

Requirements

  • Over 2 years of software engineering experience with a proven track record.
  • Have experience developing Web APIs using Ruby on Rails.
  • Have business-level English proficiency
  • Experience with SQL and maintaining relational databases in a production environment.
  • Knowledge of design patterns involving APIs that communicate with many backend components.
  • Experience with diverse testing methods, ensuring correctness through design and taking a holistic approach to quality.
  • Experience with cloud technologies (particularly AWS) and development/deployment in a cloud infrastructure.
  • Good written communication skills with remote teams across time zones
  • We are open to hiring candidates to work in Tokyo, Japan. Relocation is not supported.
  • Per current company’s hybrid working policy the candidate is required to work in the Tokyo office 3 days a week.

Nice to haves

While not specifically required, tell us if you have any of the following.

  • Have experience working in a different programming environment, such as the JVM (Java or Kotlin) or a different API style, such as JSON: API.
  • Have previous experience working on an extensive web application.
  • Have the ability to work full-stack (from the DB all the way to the Frontend).
  • Have contributed to a production-grade web application handling high traffic.
  • Have experience in developing a fully managed cloud service.
  • Have experience with microservices-oriented architectures and authentication/authorization challenges.
  • Have made open source contributions.
  • Share a GitHub link to one of your projects or profile along with your resumè.

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