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 to deliver powerful business outcomes. 

We are thrilled that Forrester has recognized Treasure Data as a Leader in The Forrester Wave: Customer Data Platforms For B2C. It's an honor to be acknowledged for our efforts in advancing the CDP industry with cutting-edge AI and real-time capabilities.

Furthermore, Treasure Data employees are enthusiastic, data-driven, and customer-obsessed. We are a team of drivers—self-starters who take initiative, anticipate needs, and proactively jump in to solve problems. Our actions reflect our values of honesty, reliability, openness, and humility.

Responsibilities & Duties:

Work the team does, and you will participate in:

• 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.
  

Required Qualifications: 

• 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
  

Nice to have: 

• 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.
  

Physical Requirements:

• 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.

About Treasure Data:

Treasure Data is the Intelligent Customer Data Platform (CDP) built for enterprise scale and powered by AI. Recognized as a Leader by Forrester and IDC, Treasure Data empowers the world's largest and most innovative companies to deliver hyper-personalized customer experiences at scale that increase revenue, reduce costs, and build trust.

Through unique capabilities such as the Diamond Record, AI Agent Foundry, and AI Decisioning with Real-Time Personalization, Treasure Data enables marketing and CX teams to personalize cross-channel engagement in real-time, optimize marketing spend while increasing ROI, and drive customer lifetime value through more intelligent retention and loyalty.

Our Dedication to You:

We value and promote diversity, equity, inclusion, and belonging in all aspects of our business and at all levels. Success comes from acknowledging, welcoming, and incorporating diverse perspectives. 

Diverse representation alone is not the desired outcome. We also strive to create an inclusive culture that encourages growth, ownership of your role, and achieving innovation in new and unique ways. Your voice will be heard, and we will help amplify it. 

Agencies and Recruiters:

We cannot consider your candidate(s) without a contract in place.  Any resumes received without having an active agreement will be considered gratis referrals to us.  Thank you for your understanding and cooperation