Site Reliability Engineer (SRE)

  • Tokyo
  • No Remote
  • Full-time
  • August 29, 2023
6,000,000 - 33,000,000 JPY /yr
Apply from Anywhere 👍
Relocation to Japan 👍
(Overseas visa sponsorship supported)
Language Requirements
Japanese: Not Required 👍
English: Business Level
Minimum Experience
Mid-level or above


As a Site Reliability Engineer (SRE), you will be responsible for ensuring a reliable and scalable platform infrastructure. You will be working closely with the development team and be an integral part of increasing the number and quality of users as the G123 platform. As the G123 platform grows its portfolio of games and expands globally, your main tasks include:

  • Build software and systems to manage platform infrastructure and applications
  • Improve services through testing and release procedures
  • Balance feature development speed and reliability with well-defined service level objectives
  • Improve reliability, quality, automation, and time-to-market of our H5 game platform.
  • Focus on all aspects of system reliability from observability, automated testing, bench-marking, fault tolerance, tracing, on-call, etc.


  • Bachelor’s degree in Computer Science, Computer Engineering, Electrical Engineering, Mathematics or a closely related computer technical field
  • Experience in using clouds (AWS/Azure /GCP/AliCloud, etc.) to design and implement systems
  • Experience in monitoring & telemetry with Prometheus/Grafana/DataDog, etc.
  • Ability to program with one or more high level languages, such as Go (preferred), Python, Node.js, and JavaScript
  • 3 years work experience in SRE, or DevOps, or Backend engineering
  • 2 years work experience in providing on-call for critical applications in production environment
  • 1 year work experience in software developing of backend system or infrastructure solutions

Good to have

  • Experience with Terraform or other equivalent IaC solutions
  • Experience with containers or Kubernetes (K8s)
  • Experience in a startup environment
  • Can adapt to fast-paced coding and sprints

Language Requirements

  • Can work in Chinese OR Japanese OR English
  • Can read and understand technical documents in English


  • Visa support
  • Free lunch catering (*after 3 months employment) and early-bird breakfast
  • Free in-office Starbucks, coffee, tea, beverages, snacks, sweets, & vitamins/supplements
  • Modern office space in the heart of Tokyo, with views of Tokyo Tower and Mount Fuji
  • Industry-leading work-life harmony: overtime is rare and discouraged
  • Commute expenses covered
  • 30,000 yen rent support if you live 2 stops from Roppongi 1-chome or Kamiyacho stations
  • Bonus for continuous employment (50,000 yen/month added to base salary after 5 years of continued employment)
  • Health insurance
  • Diverse & international environment
  • Working hours: 10:00 – 19:00, Monday to Friday (in-office)


Founded in 2013, CTW is Japan’s No.1 browser game company. Our primary service is the G123 IP game platform — which publishes video games based on famous Japanese IP.

We’ve been experiencing steady growth in revenue in the past few years as our player base has exploded to over 50 million users worldwide.

We must grow quickly to keep up with market demand.

Our CEO founded and named this company with the aspiration to "Change the World." As a fast-growing startup, we hope our team will drive themselves to try new things and accelerate their careers to match the rapid expansion of the company.

Our core values are - ambition - drive - simplicity

With global hits like Vivid Army, Queen's Blade, and many more, we’re looking to go from a market leader in Japan to an industry leader globally!



Your compensation will be determined based on your experience as well as the whole interview process. Our salary range is as follows:

  • Level 1: 6-9M JPY
  • Level 2: 8-12M JPY
  • Level 3: 10-33M JPY

The first level is for individual contributors (junior positions), while the last level is for senior and management positions.

CTW is a fast-growing Japanese company, running the html5 based platform “G123”.

Currently G123 distributes free-to-play browser games based on popular Japanese brands, including anime and manga properties to global markets.

View CTW's company page

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Site Reliability Engineer (SRE) at CTW