Senior Backend Engineer

KOMOJU Musashino-Shi, Tokyo
  • 💴 ¥12M ~ ¥14M annually
  • 🏡 Fully remote (from Japan)
  • 🧪 Minimum years of experience unspecified
  • 💬 No Japanese required
  • 🗾 Japan residents only
  • 🧳 No relocation support
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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 senior 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 a senior developer, you will need to work with our product managers 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.

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
  • Mentor junior developers and help them grow their skills
  • 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 and/or Vue.js
  • Experience with payments or payment systems
  • Business-level spoken and written Japanese

Compensation

12 to 14 million JPY annually.

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

Hiring Process

  1. 1

    Initial Screening

    Your application will be reviewed by our engineers. Rather than just your work history, we’re looking for something that demonstrates a passion for programming. This could be a personal project or open source contributions for instance. We want to work with people who love their trade, and work to improve their skills.

  2. 2

    Two interviews

    We’ll ask you to present to us something that you’ve built and can speak passionately about. Our engineers will then ask you open ended questions about what you’ve built. We’ve found this approach allows you to highlight your strengths to us, and demonstrate how you’d fit into the team.

  3. 3

    Offer

    After you pass two rounds of interviews, we’ll typically make an offer.

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Meet KOMOJU's Developers

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 his 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 her story...

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