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Principal Backend Java Engineer

Principal Backend Java Engineer


  • Perks you will love: Hybrid working; 16 - 24 paid days off; Top modern & sufficient devices
  • Solid global business: No.1 market - 13.7 million B2C users in Japan; 140,000+ paying business customers; Listed in the prime market of Tokyo Stock Exchange
  • Hub of growth support: Fintech industry; Tailored L&D programs for individual growth


  • Develop scalable, highly secure, and high-performance applications
  • Design and build a complex architecture of new products and features
  • Quickly fix system failures or abnormalities by monitoring or notifications
  • Introduce tools, systems, and cultures for efficient development
  • Develop fundamental skills of team members
  • Resolve any technical issues, risks, and challenges, escalating as necessary and providing solutions



  • At least 7 years of experience in developing web applications
  • Proficiency in Java and Kotlin for BE/willing to study Kotlin to write clear, readable, and maintainable code
  • Container-based development (Docker, docker-compose, Kubernetes) experience
  • Writing comprehensive and maintainable test code (must)
  • ​​Experience using, designing, and building GraphQL Web Service APIs
  • Extensive experience with Spring framework: Spring Boot, Spring Data, Spring Security, Spring Batch, Spring Cloud
  • Knowledge of Domain Driven Development and Onion Architecture 
  • Strong knowledge of sql (MySQL) and no-sql design/optimization and ORM 
  • Agile/Scrum software development experience
  • Experience in improving application security, performance, and operation
  • Experience in educating team members
  • Strong sense of ownership


  • Strong knowledge of security and performance
  • Strong Knowledge of microservices architecture design and implementation
  • Willingness to learn and build a deep understanding
  • Build and maintain application infrastructure built on AWS

Our benefits
Our benefits

Caring Mental & Physical Recreation:

  • Hybrid working: 2 days at the office and 3 days WFH
  • Working hour: Flexible start 8AM-9AM from Mon-Fri
  • Full salary in probation
  • Insurance: Applied from Probation period:
    • Social Insurance, Health Insurance, Unemployment Insurance (on 100% salary)
    • Private health insurance & accident insurance. From Managing level: extra for family members
  • Bonus: 13th month salary
  • 16 - 24 paid days off and more
  • Paternity leave: Extra 5 days
  • Annual company trip; Quarterly team building
  • Billiards & Running club
  • Annual health check
  • Well-equipped facility: Macbook pro, additional monitor,..

Caring Career & Development:

  • Clear Career path
  • Foreign language & International technology-related certifications sponsoring
  • External & internal training courses
  • Soft-skill workshops
  • Tech seminars
  • Monthly and biannual Recognition Awards
  • Performance & salary review: twice/year (Jun & Dec)
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