Fullstack Engineer

KOMOJU Musashino-Shi, Tokyo
  • 💴 No salary range given
  • 🏡 Fully remote (within Japan)
  • 🧪 3+ years experience required
  • 💬 No Japanese required
  • 🌏 Apply from abroad
  • 🧳 Relocate to Japan
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About KOMOJU

KOMOJU Musashino-Shi, Tokyo

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.

Key benefits

  • Developer-centric, inclusive culture
  • International at our core
  • Generous holiday policy

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 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.

Responsibilities

  • 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
  • Handle refactorings with both bravery and care

Requirements

  • 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
  • Strong understanding of OOP programming languages and patterns

Nice to haves

While not specifically required, tell us if you have any of the following.

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

Compensation

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

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Meet KOMOJU's Developers

Head of Customer Engineering Makoto Mizukami describes the unconventional candidates his unique team is looking for.

Read their story...

Nicole joined KOMOJU in 2020, and worked her way up to be technical lead of the merchant management team. She shares her journey, how KOMOJU supported her career growth and how the company is adapting to its growing needs.

Read their story...

Nigel was fresh out of college when he joined KOMOJU as a developer. He's now risen to tech lead, where he's helped build out their payment platform while maintaining a healthy work-life balance.

Read their story...

Muhammad Denaw, Senior Site Reliability Engineer at Komoju, talks about his work and shares how Komoju's trust and support propelled him to a promotion.

Read their story...

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