We are hiring a Senior Software Engineer to join a cloud-based SaaS product team serving corporate users in Japan.
You will work on core web applications that require high availability, scalability, and long-term maintainability.
Responsibilities:
Design, develop, and operate web applications end-to-end
Lead backend development using Ruby on Rails
Collaborate with frontend engineers using React and TypeScript
Design and implement APIs (REST / GraphQL)
Contribute to system architecture, performance, and reliability
Support and mentor other engineers on the team
Work in an Agile/Scrum-based development environment
Tech stack includes Ruby on Rails, Go, React, TypeScript, AWS, Kubernetes, Terraform, Kafka, and MySQL.
English is the primary working language. Japanese is not required, but willingness to learn is welcome.
This role offers a hybrid work style, modern development practices, and the opportunity to work on complex, business-critical systems.
Desired Skills and Experience
Strong experience in backend development using Ruby (Rails)
Experience building and operating large-scale web applications
Frontend development experience with React and TypeScript
API design and development using REST and/or GraphQL
Experience with cloud infrastructure on AWS
Familiarity with microservices and distributed systems
Experience with CI/CD pipelines and DevOps best practices
Agile/Scrum development experience
Ability to lead technically and mentor other engineers
Interest in improving development efficiency using AI tools
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