This position is closed and is no longer accepting applications.

Site Reliability Engineer

KOMOJU Musashino-Shi, Tokyo
  • 💴 ¥8M ~ ¥11M annually
  • 🏡 Fully remote (from Japan)
  • 🧪 Minimum years of experience unspecified
  • 💬 No Japanese required
  • 🗾 Japan residents only
  • 🧳 No relocation support


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

You will build and improve infrastructure surrounding KOMOJU by making our platform highly reliable, efficient, and scalable. You will do this by automating all things infrastructure. This position will require a heavy amount of coding, you will be less of a sysadmin and more of a programmer, working on the infrastructure instead of the application code. In a typical day you can expect to do any of the following:

Identify and eliminate manual processes in managing and deploying infrastructure Monitor the system for anomalies, and either eliminate them or automate alerts Provide infrastructure context to the development team

Our applications are mainly hosted on AWS and built with Docker to provide a consistent execution environment between development and production, and deploys are done automatically on merging a PR, through Github Actions. To support this the team have created a deploy tool, barcelona, which they actively maintain.

Because our team works mostly in Ruby you will need to be familiar with the language. Prior knowledge is not a requirement for this position, as the company will support you in learning, but your first few weeks will be spent mostly becoming familiar with Ruby.


  • Develop and automate tooling around infrastructure and monitoring
  • Work hand-in-hand with engineers to improve CI/CD workflows
  • Help improve and formalize disaster recovery at KOMOJU by shortening time to restore service in production
  • Help automate against latest vulnerabilities by services up date


  • Experience writing code
  • Past experience developing tooling around cloud-based infrastructure
  • Strong knowledge working with Linux-based systems
  • Strong knowledge around networking and security

Nice to haves

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

  • Experience of the Ruby programming language
  • Experience working with AWS and CloudFormation
  • Previous experience developing web applications
  • Able to speak Japanese


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

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


8 to 11 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


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

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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