Senior Fullstack Engineer

  • Remote OK - Worldwide
  • Full-time
  • October 13, 2023
8,000,000 - 11,000,000 JPY /yr
Apply from Anywhere 👍
Relocation to Japan 👍
(Overseas visa sponsorship supported)
Language Requirements
Japanese: Not Required 👍
English: Business Level
Minimum Experience
Senior or above

About the position

We are looking for senior engineers comfortable working with full-stack. You will primarily work with Ruby, building out features using Ruby on Rails and Typescript with Vue.js. As our platform is growing rapidly, you will help us build our platform to handle payments on a global scale.

As a senior developer you will need to work with our business analysts to define requirements and convert that into a usable architecture to discuss with colleagues. As hiring and supporting new developers is important to us you will be expected to be able to mentor junior developers, and work with them to improve their core skills.

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.


  • Understand product goals and feature requests and translate them into working software

  • Support team members through code review and architecture discussions

  • Write tests that validate the stability and correctness of implementations

  • Mentor junior developers and help them grow their skills

  • Handle refactorings 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

  • Experience and understanding of common web exploits and how to mitigate them

  • Generalist (T-shaped developer), able to jump between frontend and backend code

  • Strong understanding of OOP programming languages and patterns


8,000,000 - 11,000,000 yen / year

Includes (rough estimate of) profit share. Based on experience and skill level

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.

When it comes to engineering, we believe in having a flat, inclusive culture and constantly improving by continuing to evaluate ourselves. We also prize individuality and believe that each member brings their own unique value to the team.

Our development processes are always updating as the company grows, and we have an engineering culture that largely organizes itself and each engineer has a lot of ownership in their own projects. This culture allows engineers to showcase their strengths while continuing to grow.

KOMOJU's policies during COVID-19 are as follows:

  • During COVID-19 all of their members are working from home 100% of the time (previously they allowed up to one day a week).
  • Their current plan is to continue their full remote policy even after COVID-19 is no longer a concern.
  • They’re able to accept applications from overseas, but you may need to work abroad until it’s possible to move to Japan.
View KOMOJU's company page

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Senior Fullstack Engineer at KOMOJU