Software Engineer (Generative AI)
Salary (published): ¥8,000,000–¥12,500,000 / year (base ¥534,000–¥834,000 / month incl. 35h fixed overtime). Languages: English proficiency required — Japanese is not required.
About the role
Apply LLMs across LINE Yahoo’s consumer services — Yahoo! Maps, CarNavi, Chiebukuro — in the Local / UGC domain, from prompt engineering through LLMOps and evaluation.
Responsibilities
- Apply LLMs across LINE Yahoo services (Yahoo! Maps, CarNavi, Chiebukuro)
- Prompt engineering
- LLMOps — model operation and improvement
- Build automated evaluation frameworks
- Generative-AI model design and optimization
Qualifications
- CS background or equivalent; algorithms and data structures
- 3+ years of web/server development on Linux
- Internal LLM-application experience
- Security-risk awareness for AI/LLM
Nice to have
- Generative-AI service development
- LLM mechanisms (Tool Calling, Deep Research)
- Data design and collection
- ML/LLM security
Tech stack
LLMs, prompt engineering, LLMOps, GitHub Copilot Agent, Claude Code.
External listing — the salary range is stated on the official posting (verified live 2026-07-30). The Apply button takes you to the official LY Corporation careers page.
Working conditions
- Employer
- LINE Yahoo
- Employer contact
- https://www.lycorp.co.jp/ja/recruit/career/
- Workplace
- Tokyo (Akasaka) · Flextime
- Hình thức
- Full-time
- Working hours
- Flextime (remote-work stipend ¥11,000/month)
- Mức lương
- ¥8.0M–¥12.5M / year
These working conditions are summarized from the employer's official posting, where the full and authoritative conditions are published. Please confirm the final terms directly with the employer before accepting any offer.