Tokyo

Site Reliability Engineer - Observability

Tokyo
Partial Remote
Full-time
August 1, 2025

About KOMOJU

KOMOJU (by Degica) is 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. Today we help thousands of merchants by providing them with the payment infrastructure they need through developer-friendly API’s to integrations on popular platforms like Shopify and Wix; we help our merchants grow in all markets they are expanding.

About the position

As our systems grow in complexity, scale, and traffic, maintaining their reliability and availability becomes increasingly challenging—and critical. We're looking for a Site Reliability Engineer (SRE) with a focus for observability to help us meet these demands.

In this role, you'll be at the forefront of ensuring that our infrastructure is not just running, but understandable and measurable. Observability is a core pillar of our reliability strategy—it's how we detect issues before they impact our merchants and users, quickly understand the root causes of incidents, and continuously improve our systems performance and reliability.

You’ll design and evolve our observability platform, including metrics, logging, tracing, and alerting, and partner with development teams to embed observability into every stage of the software lifecycle. Your work will directly impact our ability to scale confidently and respond to incidents swiftly.

This is a key role for someone who wants to build resilient systems, empower teams with actionable insights, and make a real difference in how we operate at scale.

While we are a remote-first company, this position is based in Tokyo, and we expect candidates to be willing to relocate to Japan.

Responsibilities

Design, implement, and maintain our observability stack (metrics, logging, tracing, dashboards).
Define and monitor SLIs/SLOs to ensure service health and reliability.
Correspond with engineering teams to instrument applications for better visibility.
Build and maintain dashboards and alerts that provide actionable insights and minimize alert fatigue.
Troubleshoot system performance and reliability issues using observability data.
Educate and guide engineering teams on best practices in monitoring, alerting, and incident response.
Contribute to postmortems and continuously improve system transparency and resiliency.

Requirements

3+ years in SRE roles.
Hands-on experience with observability tools, preferably Datadog.
Proficiency in Terraform.
Background in software development.
Proficiency in at least one scripting or programming language (Ruby/Rails, Python, Go, Shell Script, etc.).
Experience working with AWS.
Familiarity with monitoring design principles: RED, USE, SLI/SLO, alert tuning.
Ability to analyze logs, metrics, and traces to diagnose issues and identify trends.

Nice to have

Knowledge of CI/CD pipelines and integrating observability into build and deploy processes.
Familiarity with incident response, on-call rotations, and post-incident reviews.
Business-level Japanese.

Benefits

At Degica, we embrace remote work while also offering office space for those who prefer in-person collaboration
10 days regular vacation, additional 5 days summer and 5 days winter vacation
Paid birthday holiday
Budget for self-learning allowance, to ensure our employees’ skills remain current
Language training for Japanese

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About KOMOJU

Global payments made simple

KOMOJU is the leading cross-border payment gateway for Japan. They power payments for companies like the video game distribution platform Steam and the popular mobile app TikTok. Today, they help thousands of merchants by providing the payment infrastructure they need, from developer-friendly APIs to integrations on popular platforms like Shopify and Wix. They help merchants grow in all the markets they are expanding into.

Developer-centric, inclusive culture

Engineers at KOMOJU work in a developer-centric and inclusive culture where engineers have a say in both product and technical decisions. The culture is largely self-organizing, which means engineers have both a stake and ownership in what they work on. Engineers play to their strengths, but are also able to invest in areas where they want to grow within the team. At KOMOJU, engineers are the main drivers behind their growth and position in the company.

International at core

Around half of the team members come from outside Japan. English is the primary language used within the engineering team, and throughout the company many people are bilingual.

As an international company, KOMOJU understands the importance of bilingualism. They offer all employees a choice between optional English and Japanese lessons to help create a culture of diversity and ensure smooth collaboration across teams.

Passionate about technology

Developers at KOMOJU are passionate about their craft. To foster innovation, they have a monthly open hack day where developers can work on whatever they want. It could be trying a new programming language or tool, fixing a long-standing annoyance, or something fun and experimental, like building a game.

Japanese Language Policy
With around half of KOMOJU’s total members (and around 90% of engineers) coming from outside Japan, teams generally use English for written communication(e.g. Slack, Github).

Verbal communication is also primarily in English.

However, quite a few people can speak both English and Japanese fluently, so Japanese may be spoken at times during meetings, especially when they involve teams other than engineering.

Overall, the language spoken depends on the team. The dev team uses mostly English, but the HR team (for example) speaks primarily Japanese.
Visa Sponsorship
KOMOJU sponsors visas for candidates living outside of Japan. KOMOJU also helps out with relocation (searching for apartments etc.) but they don’t have a formal policy for this. The support offered depends on each individual case. They do always pay for flight tickets to Japan in the case that someone moves from abroad.
Paid Leave
KOMOJU offers annual leave starting at 10 days, an extra paid holiday on employees’ birthdays, 5 additional vacation days that can be used during the summer months, and another 5 days of year-end holidays.
Benefits
💻 New tech gear

👩‍🎓 Skill development support

💛 Support for attending conferences

💜 Seminar participation support

📕 Book purchases

🍔 Free lunch

🍹 Free drinks

👶 Parental Leave

👩‍🏫 Language Learning Support (Language courses)

💚 Translation support (EN<>JP)

💟 Complete health and social insurance

🚃 Commuter allowance
Engineer Interview Process
Engineering Roles

KOMOJU aims to keep their hiring process thoughtful and efficient. Typically, it involves 3–4 stages depending on the role:
- Initial Screening
- Take-home Exercise
- Technical Interview (Team Interview)
- Final Interview with Leadership
Throughout the process, the team evaluates technical skills and looks for alignment with team culture and potential for long-term growth.
Work style
KOMOJU operates as a remote-first company while placing a strong emphasis on personal connections and close collaboration. The company maintains an office in the Kichijoji area of Tokyo, which employees are welcome to visit for in-person collaboration and company events, such as weekly lunches provided at no cost.

Team members have the flexibility to work from anywhere within Japan, as well as up to three months per year from abroad. KOMOJU also offers flexible scheduling, allowing employees to set their own hours as long as they are available during the company’s core hours, Monday to Friday from 10:00 to 15:00 JST.