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. By integrating cutting-edge motion planning and computer vision, it enables seamless automation for complex applications such as palletizing, picking, and truck unloading.
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.
Team Introduction
As a Software Engineer on Mujin’s Warehouse Execution System (WES) & Fleet Management (FM) team, you will focus on developing user-facing Android and web frontend applications used daily in warehouse operations. Your work directly shapes how operators interact with warehouse systems through industrial Android devices and browser-based interfaces.
The team specializes in building reliable, high-quality frontends that run in demanding production environments, where stability, performance, and usability are critical. You will work closely with backend engineers, product managers, designers, and operations teams to deliver intuitive, responsive, and maintainable interfaces that support long-running workflows and mission-critical operations at scale.
Responsibilities
React Native
Build and ship React Native features for Android
Implement UI from designs and product requirements
Integrate with backend APIs (REST/GraphQL), auth, and analytics
Debug and fix issues across devices/OS versions; improve stability
Optimize performance and app responsiveness
Write tests and support CI/CD and release processes
Participate in code reviews and maintain code quality through refactoring
Collaborate with product, design, and backend teams to deliver end-to-end features
Android
Design, develop, and maintain Android applications for industry devices used in warehouse environments.
Implement features that interface directly with device hardware layers, including barcode scanners, cameras, physical buttons, NFC/RFID, printers, Bluetooth, and other peripherals.
Work with vendor-specific SDKs.
Debug and resolve issues across application, OS, and device layers.
Build applications optimized for offline usage, long-running sessions, and high reliability.
Web Frontend
Develop web frontend applications using React and TypeScript.
Ensure applications are responsive, accessible, and work across browsers and devices.
Optimize frontend performance through profiling, bundle size reduction, and effective use of browser APIs.
Collaboration & Quality
Collaborate with Product Managers, Designers, backend engineers, and operations teams.
Participate in code reviews, knowledge sharing, and mentoring.
Triage, debug, and resolve production issues across Android and web systems.
Contribute to CI/CD pipelines, testing, and code quality improvements.
Tech Stack
Android
Kotlin, React Native
Android SDK, Android Jetpack
AOSP-based devices, OEM SDKs
Web Frontend
TypeScript, React
Tooling & Build
Rsbuild
Vitest
ESLint
Backend & Infrastructure
Python
RESTful APIs
GraphQL
Docker
Collaboration
Figma
Confluence
GitLab
Minimum Requirements
3+ years of professional software development experience.
Strong knowledge of JavaScript, TypeScript, React (Preferrably React Native), and CSS.
Experience integrating applications with device hardware features or SDKs.
Experience with testing frameworks and CI/CD pipelines.
Solid understanding of software engineering fundamentals and performance optimization.
Preferable Requirements
Experience developing Android applications using Kotlin.
Experience developing applications for industrial devices.
Proven experience maintaining shared frontend libraries or component systems.
Experience with frontend performance monitoring and optimization.
Familiarity with PixiJS, rich animations, or interactive UIs.
Experience with offline-first design and data synchronization.
Experience with Figma plugin development.
Experience with i18n and localization workflows.
Attractiveness
Android (core focus): Kotlin, device integration, reliability engineering
Web Frontend: React + TypeScript for operational and management interfaces
We are looking for those who are prepared to dedicate themselves to facing big challenges, work proactively and independently, and take ownership when working with members across the teams!
You will get your “hands dirty” working on all aspects of the industrial robot controller, not being confined to a specific component in the system. The work is challenging, mostly like something that you have never done before, requiring extensive research.
Balanced, Modern Client-Side Tech Stack
Interview Process:
Coding Assessment: Initial technical evaluation.
HR Interview: Discussion with Human Resources.
Technical Interview: One or two rounds with the frontend team's manager.
Final Interview: Cultural fit interview with hiring manager.
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
Japan Relocation Support
- Visa sponsorship
- Flight ticket support
- Shipping expenses coverage up to a specified limit
- Assistance for housing
