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Jobs at KOMOJU

Backend Engineer

KOMOJU Tokyo | Remote

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EN: business
JP: business
Employment Type
Full time

Job Description

What to expect

We are product focused, meaning you will work on our payment gateway and any other pilot projects towards building the future of KOMOJU. You will work with other engineers in a flat and inclusive culture where engineers have a say in both key product and technology decisions. The culture is largely self-organizing, which means engineers have both a stake and ownership in what they work on. Engineers play to their strengths, but are also able to invest in areas where they want to grow within the team. At KOMOJU, you are the main driver behind your growth and position in the company.

International at our core

Our founder is Canadian, and about 50% of our employees are non-Japanese. In the engineering team, we use English as our common language, and throughout the company, many people are bilingual.

Being an international company we know the importance of bilingualism. We offer all employees a choice between English and Japanese lessons.

About the position

We are looking for a backend engineer to help up build our platform to handle payments on a global scale. You will primarily work with Ruby, building out features using Ruby on Rails. As we’re still scaling our front-end team, you may be asked occasionally to work on front-end tasks as well.

As an engineer you will work collaboratively with the team, to define features and architectures, and then implement them in code. You will also provide constructive feedback through code reviews, as well as architecture discussions.

Our ideal candidate has experience working with large web applications. They will know how to build reliable, scalable, and performant web applications. Testing and code quality are also extremely important to us, so having a strong knowledge of testing and the different testing types is required.


  • Support team members through code review and architecture discussions
  • Write tests that validate the stability and correctness of implementations
  • Handle refactoring with both bravery and care



  • Experience with building performant and scalable APIs, including DB performance
  • Experience with integrating with third party APIs in a secure and fault-tolerant manner
  • Strong understanding of OOP programming languages and patterns

Nice to Haves

*These aren't required, but be sure to mention them in your application if you have them.*

  • Experience with Ruby on Rails
  • Experience with TypeScript and/or Vue.js
  • Experience with payments or payment systems
  • Business-level spoken and written Japanese

About the Company

KOMOJU (by Degica) is the leading cross-border payment gateway for Japan. We power payments for companies like video game distribution platform Steam and the popular mobile app TikTok. Today we help thousands of merchants by providing them with the payment infrastructure they need through developer-friendly API’s to integrations on popular platforms like Shopify and Wix; we help our merchants grow in all markets they are expanding.


  • At Degica, we embrace remote work while also offering office space for those who prefer in-person collaboration
  • 10 days regular vacation, additional 5 days summer and 5 days winter vacation
  • Paid birthday holiday
  • Budget for self-learning allowance, to ensure our employees’ skills remain current
  • Language training for Japanese