Backend Engineer

Job Description (Immediately after hiring) You will be responsible for the backend area, which forms the foundation of the service, supporting stability, scalability, and performance. • API design, development, and improvement • Design and implementation anticipating large-scale traffic • Database design and schema improvement • Performance improvement (response speed, load balancing) • Troubleshooting and improvement using monitoring (e.g., Sentry) • Driving improvements through collaboration with frontend and SRE teams *Disclosure of the scope of changes to job duties due to legal requirements: Job duties may change in the future. Details will be provided during the interview. Working Hours Flexible working hours (5:00 AM to 10:00 PM), 8-hour shifts. Job Requirements • Work experience in Japan • Backend development experience (any language: Go / Ruby / Java / PHP, etc.) • Japanese language proficiency: JLPT N3 or higher • Other languages: English is acceptable for those who are not proficient in Japanese. • English Level: Business Conversation Level (TOEIC 735-860) • Japanese Level: Daily Conversation Level Salary JPY 4000K - JPY 8000K. Salary from previous job will be taken into consideration and is negotiable. 45 hours of overtime pay will be provided regardless of whether or not overtime work is performed. Holidays • Weekends and public holidays off (125 days off per year) • Annual paid leave, year-end and New Year holidays, summer holidays, caregiver leave, maternity leave, special leave Job Contract Period Full-time employee