Senior Software Engineer (Robotics OS Validation & Simulation)

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. The Senior Software Engineer (Robotics OS Validation & Simulation) is responsible for validating the Mujin OS across our entire robotics ecosystem used in live warehouses and factories. In this role, you will design the automated testing architecture that ensures robotic systems behave correctly when deployed in real production environments. Rather than testing isolated components, you will validate how complete systems operate together—including robot arms, custom end-effectors, vision systems, conveyors, and other industrial equipment. Most validation is performed through large-scale simulation environments that reproduce real customer deployments. The test infrastructure runs continuously in automated environments to ensure Mujin OS continues to operate safely and reliably in production as the system evolves. This role is ideal for engineers who enjoy working on complex, real-world systems where software, hardware, networking, and physics intersect. Key Responsibilities Testing Infrastructure Design and implement test automation frameworks that validate cross-functional behaviors of robotic systems within Mujin OS (e.g., vision-to-motion coordination, robot-to-conveyor synchronization). Build end-to-end test cases that simulate real customer deployments and operational workflows. Develop simulation components representing robots, sensors, conveyors, and warehouse systems. System Validation & Debugging Analyze test results and system telemetry to detect behavioral issues or performance regressions. Work with cross-functional engineering teams to isolate and resolve system-level failures. Technical Leadership Improve testing methodology and infrastructure across the engineering organization. Review code and mentor engineers in testing practices and quality engineering. Minimum Requirements BSc degree or higher in Computer Science, Computer Engineering, Robotics, or related fields (or equivalent academic or work experience). Proven experience developing production-quality software systems, not just test scripts. Proficiency in designing and implementing test automation frameworks and test cases for software systems. High proficiency in Python for developing test automation frameworks and test cases. Advanced Linux user with extensive experience in Linux software development. Business-level English communication skills. High motivation to deliver a high-quality robotics software platform and make a positive impact on the world. Preferred Qualifications Robotics Systems Experience with robotics frameworks (ROS, OpenRAVE, or similar). Experience working with robotic simulation environments. Software Systems Strong knowledge of distributed systems and inter-process communication. Experience with messaging systems (e.g., ZeroMQ). Testing & Automation Advanced experience with Pytest. Experience building large-scale automated test systems. Experience with E2E frameworks (e.g., Playwright). Others Familiarity with 3D programming and rendering pipelines. Proficiency in C++ or TypeScript. Business-level Japanese communication skills. Why This Role? You will not be running repetitive manual tests or writing simple web automation. Instead, you will design the systems that validate how multiple machines—robots, sensors, conveyors, and software—interact in a shared physical workspace. Your work will ensure that complex robotic systems configured by customers operate reliably in real production environments. Interview Process: Coding Assessment: Initial technical evaluation. HR Interview: Discussion with Human Resources. Hiring Manager Interview: One or two rounds with the hiring manager. Take-Home Assignment & Feedback Interview (If Applicable): A task to complete on your own, followed by a feedback session. 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 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