This position is closed and is no longer accepting applications.

Senior Site Reliability Engineer

KOMOJU Musashino-Shi, Tokyo July 21 2025
  • 💴 No salary range given
  • 🏡
    Fully remote
    From Japan
  • 🌏
    Apply from abroad
    Relocate to Japan
  • 💬
    No Japanese required
    Business English
  • 🧪
    Senior level
    2+ years experience required

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

As a Site Reliability Engineer (SRE) at Degica, you will play a critical role at the intersection of software engineering and infrastructure operations. This position is ideal for engineers who are passionate about automation, systems design, and building scalable, reliable platforms.

In this role, you won’t be limited to just managing cloud infrastructure—you will take ownership of the platform’s overall health, performance, and developer experience.

Responsibilities

  • Cloud Infrastructure Management: Actively participate in improving and maintaining our AWS infrastructure. Architect, implement, and maintain robust and secure infrastructure in a cloud-native environment using Terraform. You’ll ensure high availability, scalability, and resilience of our systems.
  • CI/CD and Deployment Automation: Design and improve continuous integration and continuous delivery pipelines that empower development teams to ship software reliably and rapidly.
  • Observability & Monitoring: Implement end-to-end observability tooling—including metrics, logging, distributed tracing, and alerting—to provide real-time insight into platform performance and help reduce mean time to detection and resolution.
  • Platform Quality & Reliability: Champion best practices for reliability, scalability, and performance across engineering teams.
  • Secure the system and adhere to compliance
  • Be part of the teams on-call rotation

Requirements

  • 2+ years in SRE roles working with the AWS platform.
  • 2+ years experience in a software development role
  • Hands-on experience with observability tools, preferably Datadog.
  • Proficiency in Terraform.
  • Proficiency in at least one scripting or programming language (Ruby/Rails, Python, Go, Shell Script, etc.).
  • Experience on working with CI/CD tools such as GitHub Actions, Jenkins, Circle CI, etc.

Nice to haves

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

  • Strong communication skills to work closely with outside companies and various departments inside the organization
  • Knowledge of TCP/IP and other networking protocols
  • Experience with AWS Direct connect

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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