Backend Engineer

Date PostedJune 30, 2026LocationAsia Japan Tokyo MeguroCompanyWith World Corp.SalaryJPY 5000K - JPY 10000KTypeit (pc, web, unix) - back-end engineer it (pc, web, unix) - web application se it (pc, web, unix) - fullstack engineer

Job Summary

You will be involved in all phases of backend development for global business products, ranging from planning and design to development and operation. The role requires collaboration with cross-functional teams across Japan, the US, and EU offices to maintain and improve AI-powered products. Candidates should have extensive experience in C#, .NET, and cloud platforms to contribute to full-cycle development.

Responsibilities

  • Design and develop new features for AI-powered products
  • Perform full-cycle development including maintenance and operations
  • Collaborate with international teams across Japan, US, and EU offices
  • Resolve technical debt and optimize database performance

Required Skills

  • 3+ years in backend development
  • Proficiency in C#, .NET Framework, and TypeScript
  • Experience with Angular and Microsoft Azure
  • Business English and Native-level Japanese (N1)

Job Details

### Job Description You will be involved in all phases of backend development for our global business products, from planning and design to development and operation. You will be engaged in a wide range of tasks, from designing and developing new features for AI-powered products to resolving technical debt and developing new products. 1. Contributing to Business Growth • Designing and developing new features • Improving and refactoring existing features • Developing new products 2. Project Execution • Requirements gathering • Task and ticket management • Requirements definition, design, implementation, review, and testing 3. Operation and Maintenance • Participating in maintenance and operations in addition to development to achieve full-cycle development • Improving operation and maintenance mechanisms • Bug fixing/inquiry handling, issue identification, and feature improvement • Creating SQL for business research ### Technical Environment • Programming Languages: C#, Python, TypeScript • Backend Frameworks: ASP.NET Core, FastAPI • Frontend Framework: Angular • Infrastructure: Microsoft Azure, Google Cloud Platform • Databases: SQL Server, Cosmos DB, MySQL • Others: Slack, Jira, Confluence, esa, Ovice, etc. ### Working Conditions • 10:00 AM - 7:00 PM (Break time: 60 minutes) • Overtime work: Yes • Remote work: Possible (at least one day of office attendance per week) ### Requirements • Japanese: Near native level (N1 level conversation, reading, and writing) • English: Business level (conversation, reading, and writing) • Practical experience in backend development using web application frameworks (3 years or more) • Development experience with C# + .NET Framework • Development experience with Typescript + Angular • Development experience on the Microsoft Azure platform • Development experience in a multi-regional team ### Benefits • Health insurance, employee pension, employment insurance, workers' compensation insurance • Access to a sports gym/physical maintenance • Housekeeping/babysitting • Learning expense subsidy (full reimbursement of book purchase costs, subsidy for participation in external seminars) • Monthly company social gathering expense subsidy • Health checkup expense reimbursement; Welfare benefits associated with TJK membership • Influenza vaccinations • Company-leased housing system • Subsidies for company club activities and study groups • Coverage of personal information protection specialist examination fees and passing bonuses • Subsidies for relocation expenses • Paternity leave system • Side jobs permitted (prior approval required) ### Holidays • Annual holidays: 127 days • Complete two-day weekend (Saturday, Sunday, and public holidays) • Year-end and New Year holidays • Annual paid leave (granted after 3 months) • Self-development leave (up to 5 consecutive days once a year) • Maternity and childcare leave