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Platform Engineer

Mujin

Responsibilities

  • Develop and improve internal tools and services that support engineers across Mujin.
  • Work across CI/CD, build tooling, release workflows, documentation tooling, log collection, and internal support workflows.
  • Work on a broad range of engineering problems:

Requirements

3+ years of professional software engineering experience

  • Hands-on experience designing and building software services, command-line tools, developer tools, or internal engineering systems
  • Experience contributing to software across multiple technical areas or layers of a system
  • Understanding of software development workflows, including areas such as CI/CD, build systems, testing, deployment, or release processes

Preferred

  • Experience working in a Platform Engineering, Developer Experience, Engineering Enablement, or similar team
  • Experience building tools or services used by a large engineering organization
  • Experience with Rust, Go, or Python

About the Team

The Engineering Enablement team builds the internal platforms, services, and tools that help Mujin engineers develop, test, release, and support software effectively. The team works across a broad range of areas, including CI/CD, build systems, testing infrastructure, release workflows, observability, and internal developer tooling.

Team members bring different areas of expertise while contributing across the broader platform. You will work closely with experienced engineers in the team, initially contributing to areas such as CI/CD, release and support workflows, and internal developer tooling, with opportunities to expand into other Platform Engineering areas over time.

About the Position

This role is intended for a software engineer who already has hands-on experience building and maintaining software, services, or developer tooling and wants to develop deeper expertise in Platform Engineering and Developer Experience.

You will contribute to both existing tools and workflows and new development, including internal services, automation, CI/CD pipelines, release and support workflows, and developer-facing tools. Rather than focusing primarily on infrastructure operations, you will build software that improves how engineering teams work across Mujin.

You do not need to come from one specific Platform Engineering background. We value broad software engineering experience and practical experience with developer tooling, automation, CI/CD, or related areas.

Shape the developer experience

Contribute to both new tools and existing systems, with opportunities to work across Rust, Go, and Python.

Build for modern development environments

Develop and improve tooling and services used in containerized environments, including Docker and Kubernetes.

Minimum Requirements

  • Professional programming experience with at least one general-purpose language such as Rust, Go, Python, C++, or a comparable language
  • Ability to collaborate with engineers and understand the needs of internal users

Interview Process

  • Resume Screening
  • Take-home coding test

Technical interview

Culture/Team fit interview

Attractives

  • Impact engineering at scale: Build tools and services used by engineering teams across Mujin.
  • Broaden your engineering experience: Work across a wide range of areas, from CI/CD and build tooling to release and support workflows.
  • Build, not just operate: This is a software engineering role where you will develop tools and services, rather than focusing primarily on infrastructure operations.

Location

  • 3-8-5 Tatsumi, Koto-Ku, Tokyo 135-0053, Japan
  • Work Hours
  • 8:45 - 17:45 (with a 60-minute break)

Salary

  • Based on experience and skills
  • Salary revision twice a year
  • Additional bonuses are available based on performance
  • Holidays
  • Every Saturday and Sunday
  • Annual paid leaves

Maternity leave and Childcare leave

  • Flex Holiday (take public holidays on days of your choice)
  • Other holidays as defined by the company

Company Benefits

  • Explore Mujin Perks & Welfare Benefits
  • Flexible dress code policy
  • Commuting allowance
  • Japanese Social Security (Health Insurance, Pension, Labor Insurance)
  • Monthly team dinner support
  • Free buffet lunch every workday
  • Free vending machines (offering drinks and snacks)
  • High-end coffee machine
  • Exclusive Employee Gym Access
  • Japan Relocation Support
  • Visa sponsorship
  • Flight ticket support
  • Shipping expenses coverage up to a specified limit
  • Assistance for housing