Jobs / Senior Full Stack Engineer with Strong Backend Skills
Jobs at Colorkrew

Senior Full Stack Engineer with Strong Backend Skills

Colorkrew Tokyo | Hybrid
EN: business
JP: none
7-11 million JPY (based on performance)
Employment Type
Full time

Job Description

"Mamoru Biz" is to reduce unproductive work though QR code and app.

Using QR and authentication technology, you can easily manage seats, schedule appointments, manage company equipment, and send mail.

"Goalous" is an internal social networking service that improves teamwork by sharing team members' activities and goal progress.

Colorkrew is also developing various other services.

We are looking forward to further evolving these services and developing new features.


  • Collaborate with product managers, designers and engineers to deliver high-quality frontend components and backend services
  • Participate in and contribute to the planning processes to design products that fit within business and technical constraints
  • Respond quickly and independently to the rapidly changing needs of users
  • Develop and optimize both backend and frontend service and infrastructure


Must Have 

  • Experience in mid- to large-scale service development and operations including infrastructure (more than three years)
  • Whole system architecture design (more than three years)
  • Development and operation experience in a cloud or virtual environment
  • Experience developing systems using server side languages (C++, PHP, Ruby, Java, Python, Go, etc.) (more than five years)
  • Experience in design and operation of database infrastructure (SQL Server, MySQL, PostgreSQL, NoSQL) (more than three years)
  • Excellent communication skills in English (Japanese is not required)
  • Proficiency of JavaScript / TypeScript, CSS, or HTML and experience with modern frontend frameworks (React, Vue, Svelte, etc) is a plus

Nice to Have

  • Experience in a technical leadership role leading project teams and setting technical direction
  • Experience working in a complex, matrixed organization involving cross-functional, and/or cross-business projects

About the Company

Under the vision of developing services that move hundreds of millions of people, Colorkrew operates over four pillars: Cloud management, Web system & App development, Authentication & Payment method and Marketing & Promotion.

Combined with our spirits of being passionate, honest and authentic, we created Goalous (, Mamoru Biz and Mamoru PUSH (, indispensable corporate tools for a successful business. These three products promote a better understanding of company’s goals, easy communication, more enjoyable and simple work environment and of course, safety.


  • 7M-11M yen (Based on performance)
  • Salary revision 2 times a year
  • Trial period: (same conditions) 3 months
    (There will be real-time opportunities for advancement during the first six months.)

Working Hours

  • Flextime (Core time 10:00 to 14:00)

Holiday / Vacation, Other

  • Full five-day work week (Saturday & Sunday off), public holidays, summer and winter holidays, annual paid leave, special leave
  • Various insurances
  • VISA Support
  • Relocation support
  • Company provides a computer
  • Indoor principle non-smoking (smoking room available)

Selection Process

  1. Document screening
  2. Coding challenge
  3. Coding session
  4. Technical interview (several rounds possible)
  5. Final interview with CEO