This position is closed and is no longer accepting applications.

Site Reliability Engineer

KOMOJU Musashino-Shi, Tokyo March 25 2025
  • 💴 ¥8M ~ ¥11M annually
  • 🏡
    Fully remote
    From Japan
  • 🌏
    Apply from abroad
    Relocate to Japan
  • 💬
    No Japanese required
    Business English
  • 🧪
    Intermediate level
    Unspecified years of experience

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

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.

Responsibilities

  • 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

Requirements

  • 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

Compensation

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

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

Compensation

¥8,000,000 ~ ¥11,000,000 annually.

Hiring Process

  1. 1

    Initial screening call with HR

    To understand candidates’ overall professional background, career aspirations, and to evaluate the fit for the role/ culture.

  2. 2

    Take-home exercise

    It’s opportunity to evaluate candidates’ practical experience and observe that they follow best practices.This includes, but is not limited to, their coding skills, problem-solving abilities, system design capabilities and ability to optimize and maintain code. We normally give the applicant one week to complete it, but we don’t expect it to take more than 2 hours.

  3. 3

    Technical team interview

    This interview serves two purposes: it’s a chance to review the take-home exercise and assess the candidate’s technical abilities, and it also helps evaluate their soft skills, how well they collaborate with stakeholders and team members, manage their work (time management, prioritization, adaptability), and demonstrate a commitment to continuous learning.

  4. 4

    Final interview with leadership

    We’re looking here to assess culture add. We’re not looking for people that just fit the status quo (culture fit), we want candidates who can bring something new and valuable to our culture. While ensuring that they still align with our core values, we want to assess their ability to adapt to recent changes within the organization and to help guide the organization through its next stage of development.

Meet KOMOJU's Developers

Kazunori initially joined KOMOJU as a web application engineer, but by identifying problems he wanted to fix, his role shifted first to VP of Infrastructure, and then VP of Payment Products.

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...
Photo of Richard Ramsden

Becoming CTO of KOMOJU

with Richard Ramsden

After graduating from university, Richard came to Japan and found a job as a software developer. Eventually he joined KOMOJU, where he rose to the role of CTO.

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...

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

Read their story...

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