Full-Stack Developer (Japan)

The role

Contributors will design and evaluate realistic software engineering tasks. This includes bug resolution, feature implementation, refactoring/migration, and test generation.

What you will do

• Design and implement multi-file coding tasks across bug fixing, feature development, refactoring, and testing
• Write clear natural-language specifications and reference implementations
• Develop and extend unit and integration test suites
• Review peer-generated tasks for correctness, clarity, and realism
• Identify edge cases, ambiguities, and potential failure modes
• Ensure alignment between specifications, code, and expected outputs

Required qualifications

• Advanced professional written proficiency in English
• 3–7 years of professional software engineering experience
• Strong proficiency in Python and JavaScript/TypeScript
• Working knowledge of Java, C#, or Go
• Backend or full‑stack development experience in production systems
• Experience with testing frameworks (e.g., pytest, Jest, JUnit, xUnit, Go testing)
• Proven ability to debug and navigate large, multi‑file codebases
• Experience with code reviews, refactoring, and production migrations
• Speak Japanese

About the company

Anyone AI is recruiting skilled software engineers to work on a project with a leading AI Lab.