Mechanical (Mechatronics) Engineer

Spacer Robotics • San Francisco, CA

8d • Onsite

About The Position

Spacer Robotics is building autonomous, non-humanoid robotic systems to construct infrastructure in extreme environments, from lunar bases to next-gen terrestrial job sites. Our vision is to disrupt the $16 trillion global construction industry by pioneering a new Deep Tech philosophy that blends robotics, AI, and systems engineering at the frontier.

We're looking for a Mechatronics Engineer to own the hardware-software integration layer of Spacer's first robot. This is a deeply hands-on, cross-disciplinary role spanning mechanical systems, electronics, actuator control, embedded interfaces, and sensor integration. You'll work at the intersection of physical hardware and the software stack that drives it, debugging issues that span both worlds and building systems that have to work reliably in the real world.

As one of the first technical hires, you'll have direct influence over how we build, what we build, and how we validate it. You'll collaborate daily with the software team and hardware lead to take designs from bench to field.

This role is 5 days a week, on-site in the San Francisco Bay Area. We are building hardware. The robot is here. The team is here. Rapid integration and iteration require us to be in the same room.

Requirements

• B.S. or M.S. in Mechatronics, Mechanical Engineering, Electrical Engineering, Robotics, or related field
• 3+ years of hands-on experience in robotic system development, hardware-software integration, or mechatronics
• Strong programming skills in Python and/or C++, with experience in robotic frameworks (ROS / ROS2)
• Deep understanding of robotic system architecture including sensors, actuators, controllers, and embedded interface.
• Experience with motor controllers, firmware interfaces, and real-time communication protocols (CAN Bus, I2C, UART, SPI)
• Proficiency in CAD tools (SolidWorks preferred) and ability to create GD&T-informed engineering drawings
• Strong problem-solving mindset with demonstrated ability to debug across hardware-software boundaries
• Experience with test automation, data analysis, and structured system validation
• Comfortable working hands-on: building, assembling, and iterating on physical prototypes

Nice To Haves

• Experience with embedded systems, RTOS, or low-level hardware control on edge compute platforms (NVIDIA Jetson or similar)
• Familiarity with FEA or structural analysis tools for mechanism design validation
• Background in industrial, construction, mobile, or field-deployed robotics
• Experience with sensor fusion pipelines (EKF, UKF, or factor graph-based methods)
• Familiarity with functional safety principles, fault tolerance, and degraded operation modes
• Prior experience in an early-stage startup or prototype-to-production environment

Responsibilities

• Own integration of sensors, actuators, and controllers into the ROS2 software stack, from driver development to validated field performance
• Debug complex hardware-software interaction issues spanning firmware, real-time communication protocols, and application-layer behavior
• Develop and maintain hardware abstraction layers for sensors and actuators, enabling clean interfaces between physical components and the autonomy stack
• Integrate and validate motor controllers, encoders, proximity sensors, and the tying mechanism's electromechanical subsystems
• Define and manage TF trees, message interfaces, and real-time data pipelines across the full sensor suite
• Design, prototype, and iterate on mechanical assemblies and end-effector components using CAD (SolidWorks or equivalent)
• Create GD&T-informed drawings, BOMs, and assembly documentation for fabrication and production
• Select sensors based on environmental constraints, dust, vibration, outdoor lighting, and construction-site conditions
• Perform hands-on assembly, bench testing, and field validation of electromechanical subsystems
• Support PCB-level work and wiring design for power distribution, signal routing, and harness integration where needed
• Build and run test automation, system validation procedures, and hardware-in-loop testing pipelines
• Perform root-cause analysis on hardware failures, integration bugs, and field anomalies
• Define quantitative metrics for system reliability, actuator performance, and sensor data integrity
• Conduct stress testing across environmental conditions, vibration, dust ingress, temperature variation, representative of real construction sites
• Contribute to safety validation including emergency stop behavior, collision response, and fail-safe logic

Benefits

• At Spacer Robotics, you won't just be writing code, you'll see your work run on a real robot, on a real construction site, doing a job that matters.
• You'll join a small, technical team where your contributions have direct impact and your growth into robotics is intentional and supported.
• This is an early opportunity to help build the engineering foundation of a company with a large, defined technical mission.
• If you're excited about autonomous systems, curious about physical AI, and want to ship something real, we want to hear from you.
• The US base salary range for this full-time position is competitive and benchmarked to Bay Area market rates, plus meaningful early-stage equity.
• The total compensation package may also include additional components depending on the role.
• This information will be shared if an employment offer is extended.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level