Full-Stack Product Engineer

Date PostedJune 29, 2026LocationTokyo, Shibuya, JapanCompanyDejimal IncSalaryJPY 5500K - JPY 7500KTypeit (pc, web, unix) - web application se it (pc, web, unix) - database se

Job Summary

The Product Engineer will be responsible for end-to-end development of an e-commerce subscription platform, covering requirement definition to deployment. The role involves designing system architecture, developing new features, and managing AWS infrastructure while collaborating with business stakeholders. You will work in a fast-paced environment, prioritizing system quality and performance to enhance user experience.

Responsibilities

  • Define system requirements and specifications
  • Design system architecture and databases
  • Develop, refactor, and maintain platform features
  • Manage AWS infrastructure and deployment
  • Conduct code reviews and quality control

Required Skills

  • 3+ years Backend development
  • Ruby on Rails proficiency
  • AWS infrastructure management
  • Fluent Japanese (N2) & Business English
  • Experience in E-commerce or Subscription services

Job Details

Job Description: • Requirements Definition: Collaboration with the business side to align requirements, consider system requirements and issues, and define specifications. • Architecture Design and Database Design for Each Measure • New Feature Development, Modification, and Refactoring • API Design / External Service Integration Design • Infrastructure Design using AWS • Test Code Implementation and Quality Control • Code Review for Team Members Development Environment: • Languages: Ruby, JavaScript • Framework: Ruby on Rails • DB/Middleware: MySQL, Redis • Server Environment: AWS • Testing: RSpec, Circle CI • Project Management: GitHub, Figma, Google Workspace • Monitoring: Mackerel, BugSnag, Redash Working Hours: • Remote work: 3 days remotely per week, 2 days in the office per week • Flexible working hours (8 hours of scheduled work, core time 12:00-17:00) Job Requirements: • Backend development experience (3+ years) • Experience from requirements gathering to design, development, and operational development • Experience collaborating with stakeholders outside engineering and with clients • Business conversation level English (TOEIC 735-860) • Business level Japanese (JLPT N2) Preferred Skills/Experience: • Experience developing with Ruby on Rails • Frontend development experience • Experience operating EC, Subscription, or D2C services • AWS environment construction and operation management