Full Stack Engineer
Couger Inc. is a Tokyo-based AI company developing human-like AI and virtual human agent products, including the LUDENS platform and RACHEL.
Maintainer signals as of 9/2/2026
About Couger Inc. (クーガー株式会社)
Couger develops AI technologies spanning computer vision, natural-language processing, large-scale systems, robotics, and virtual human agents. Its current flagship offering is RACHEL, a human-like AI assistant deployed across approximately 7,000 FamilyMart stores, while LUDENS is the underlying human-like AI platform.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
Design, implement, test, and operate backend Web APIs and large-scale data processing pipelines using Go, Python, and cloud services. Build and maintain web frontends with TypeScript, React, and Next.js, implement test automation and CI/CD, improve performance, refactor code, develop shared libraries and UI components, and respond to on-call incidents.
Requirements
- 2+ years of backend development experience in Python or JavaScript
- 2+ years of frontend development experience with TypeScript, React, or Next.js
- Experience designing, developing, and operating Web APIs and data processing pipelines on cloud services
- Experience with database design, development, and operation using RDBMS, NoSQL, or NewSQL
- Experience using Git for version control
- Business-level Japanese proficiency equivalent to JLPT N1
Responsibilities
- Develop and operate backend systems including Web APIs and data processing pipelines
- Design and implement frontend web applications with TypeScript, React, and Next.js
- Write and maintain automated tests and test code
- Improve performance and refactor legacy code to reduce technical debt
- Develop and maintain shared internal libraries and UI components
- Manage deployments and CI/CD pipelines
- Respond to on-call incidents and perform operational troubleshooting
Benefits
- Complete social insurance through the Kanto IT Software Health Insurance Association
- Commuting allowance
- Communication allowance
- On-call allowance
- Company-provided MacBook Pro or Windows PC
- Paid holidays and leave including weekends, national holidays, year-end and New Year holidays, annual paid leave, summer leave, sick leave, and bereavement leave
