Middle Frontend Engineer（React Native）

Mujin is a global leader in industrial automation, redefining supply chain efficiency through MujinOS—our intelligent operating system for robotics. At our core is Machine Intelligence (MujinMI), a unique approach that leverages real-time digital twins and advanced perception, planning, and control algorithms to achieve fully autonomous operations.

Our flagship product, MujinController, empowers users with a highly configurable, no-code interface[cite: 1]. By integrating cutting-edge motion planning and computer vision, it enables seamless automation for complex applications such as palletizing, picking, and truck unloading[cite: 1].

Headquartered in Japan with a growing presence in the US, China, and Europe, we invite you to join a dynamic environment where you can shape the future of automation[cite: 1].

Team Introduction

As a Frontend Engineer on Mujin’s Warehouse Execution System (WES) & Fleet Management team, you will develop user-facing applications used daily in warehouse operations[cite: 1]. Your work will shape how operators interact with warehouse systems through browser-based interfaces and industrial Android devices[cite: 1].

You will build reliable, responsive, and intuitive interfaces for demanding production environments, where stability, performance, and usability are critical[cite: 1]. Working closely with backend engineers, product managers, designers, and operations teams, you will deliver features that support warehouse workflows and help users monitor and manage automated operations[cite: 1].

The role spans frontend architecture, reusable UI components, backend integration, and development tooling, with opportunities to contribute across the application stack[cite: 1].

Responsibilities

• Design, develop, and maintain user interfaces for WES and fleet management applications across web and industrial Android devices[cite: 1].
• Build reusable, high-performance UI components that support real-time operational data and long-running warehouse workflows[cite: 1].
• Collaborate with designers and product managers to translate operational requirements into intuitive, accessible user experiences[cite: 1].
• Integrate frontend applications with backend APIs and collaborate with backend engineers to deliver end-to-end features[cite: 1].
• Improve application stability, responsiveness, and maintainability through profiling, debugging, and refactoring[cite: 1].
• Develop and improve testing, localization, build, and release pipelines[cite: 1].
• Investigate and resolve production issues in collaboration with engineering and operations teams[cite: 1].
• Participate in code reviews and share knowledge across the team[cite: 1].
• Occasionally travel to customer sites in Japan and abroad to understand operational needs and support deployment[cite: 1].

Minimum Requirements

• 2+ years of professional software development experience[cite: 1].
• A bachelor’s degree or higher in Computer Science, Computer Engineering, or a related field, or equivalent academic or professional experience[cite: 1].
• Proficiency in Python[cite: 1].
• Product development experience using desktop, mobile, or web UI frameworks[cite: 1].
• Familiarity with Linux software development and toolchains[cite: 1].
• English communication skills sufficient for technical discussions and collaboration[cite: 1].

Preferable Requirements

• Product development experience using React, Babylon.js, or WebGL[cite: 1].
• Proficiency in TypeScript and JavaScript[cite: 1].
• Knowledge of asynchronous programming and threading[cite: 1].
• Familiarity with localization and translation pipelines[cite: 1].
• Experience developing C++ and Python addons[cite: 1].
• Full-stack development experience[cite: 1].

Attractiveness

- Build software that directly supports real-world warehouse operations[cite: 1]. You will see your work used by operators and contribute to interfaces that make complex automation easier to understand and manage[cite: 1].

- Our team works collaboratively, reviews ideas openly, and encourages continuous learning[cite: 1]. You will have opportunities to take ownership from design through deployment, solve challenging technical problems, and work across frontend and backend systems alongside engineers with deep expertise in industrial automation[cite: 1].

Interview Process:

• Coding Assessment: Initial technical evaluation[cite: 1].
• HR Interview: Discussion with Human Resources[cite: 1].
• Technical Interview: One or two rounds with the frontend team's manager[cite: 1].
• Final Interview: Cultural fit interview with hiring manager[cite: 1].

Location

3-8-5 Tatsumi, Koto-Ku, Tokyo 135-0053, Japan[cite: 1]

Work Hours

8:45 - 17:45 (with a 60-minute break)[cite: 1]

Salary

• Based on experience and skills[cite: 1]
• Salary revision twice a year[cite: 1]
• Additional bonuses are available based on performance[cite: 1]

Holidays

• Every Saturday and Sunday[cite: 1]
• Annual paid leaves[cite: 1]
• Maternity leave and Childcare leave[cite: 1]
• Flex Holiday (take public holidays on days of your choice)[cite: 1]
• Other holidays as defined by the company[cite: 1]

Company Benefits

Explore Mujin Perks & Welfare Benefits[cite: 1]

• Flexible dress code policy[cite: 1]
• Commuting allowance[cite: 1]
• Japanese Social Security (Health Insurance, Pension, Labor Insurance)[cite: 1]
• Monthly team dinner support[cite: 1]
• Free buffet lunch every workday[cite: 1]
• Free vending machines (offering drinks and snacks)[cite: 1]
• High-end coffee machine[cite: 1]
• Exclusive Employee Gym Access[cite: 1]

Japan Relocation Support

• Visa sponsorship[cite: 1]
• Flight ticket support[cite: 1]
• Shipping expenses coverage up to a specified limit[cite: 1]
• Assistance for housing[cite: 1]