Jobs / Senior Frontend Engineer
Jobs at Mujin

Senior Frontend Engineer

Mujin Tokyo
EN: none
JP: none
Employment Type
Full time

Job Description

 As a Senior Frontend Engineer at Mujin, you will guide junior team members and enhance the efficiency of our real-time user interface.

The Frontend Team at Mujin is devoted to refining the user experience and interface of our robot controller's web UI. You will collaborate with skilled and committed engineers who possess expertise in this field. Read our team's interview article here:> At the forefront of building ”industrial robots for everyone”


  • Develop and implement high-quality frontend applications using React and TypeScript, adhering to best practices and coding standards
  • Create and maintain reusable components and libraries to promote consistency and efficiency across projects
  • Optimize application performance by analyzing code, profiling, reducing bundle size, and leveraging browser APIs where possible
  • Ensure the application is responsive and works seamlessly across different browsers and devices
  • Review code and mentor junior developers to ensure quality and adherence to coding standards


Minimum Requirements

  • Extensive knowledge of JavaScript, TypeScript, React, and CSS
  • Experience creating visual effects and animations using CSS and SV
  • Familiarity with Webpack, Rollup, esbuild, or other bundling tools. Comfortable creating and maintaining bundler configurations
  • Extensive knowledge of web application optimization
  • Proven track record of maintaining JavaScript libraries
  • Experience with Jest, Mocha, Testing Library, or other testing frameworks, and deep understanding of CI/CD pipelines

Preferable Requirements

  • Experience with Figma plugin development
  • Familiarity with GraphQL
  • Experience with PixiJS for building rich and interactive web applications
  • Ability to automate code quality checks with Eslint and SonarQube to ensure the highest code quality
  • Knowledge of Rust and Web Assembly for building performant and efficient web applications
  • Familiarity with i18n to develop applications that can be easily localized


  • We work in a fast-paced, agile environment where we constantly collaborate, review ideas amongst peers, and test proposed solutions. We encourage continuous learning and brainstorming within our teams. We are focused on solving real-world problems and your contributions are deployed at an amazingly fast pace to empower industrial robots to perform tasks that were previously impossible.
  • Japan is known for its robotics technology. If you are coming to Japan why not work with products you can only build in this country?

About the Company

Mujin develops and sells "intelligent robot controllers" with the goal of building a common platform for industrial robots. Conventional robots are suitable for automating repetitive work, but traditionally they've been hard to install in environments where products and surroundings change. Most robots have complex settings that are hard to change for each use case. Mujin's tech solves this problem using technology called motion planning. It allows them to provide solutions that replace heavy but simple work done by humans with automation by robots. The technology is used primarily for logistics and manufacturing applications.

Work Location

Tatsumi office: 3-8-5 Tatsumi, Koto-ku, Tokyo, 135-0053 Japan

Working Hours

8:45~17:45 (Includes 1-hour break)


  • 2 full days off per a week (Saturday, Sunday)
  • Holidays scheduled on the Company’s calendar
  • Paid Leaves
  • Congratulation/Condolence, Maternity/Childcare, Family Caregiver Leave

Expected Salary

  • Flexible depending on experience and skills