Mechanical Design Engineer - Robot Parts & Enclosures (Contract)

About OS3

Intelligence and Machines for Physical Labor

Tech description:

We build the full stack of general-purpose robotics: custom robot hardware and the AI that runs it. Owning both sides gives us a complete data flywheel — our robots collect data in the real world, that data trains our models, and improved models go back on the robots within days.

Our engineering work spans:

- Training VLAs and world models
- Simulation-based training to reduce the need for real robot data
- Reinforcement learning from real-world robot rollouts, improving policies beyond what imitation alone can reach
- Physics simulation with sim-to-real evaluation gates, and GPU inference infrastructure serving policies to robots in real time
- Real-time control software, teleoperation-based data collection, and safety systems
- Custom mechanical design for CNC, sheet metal, and 3D printing, along with custom electronics

Job description:

We design and build our robots in-house, from structural parts to exterior covers, and iterate on them continuously as the robots run in the real world. You'll own the CAD design of robot parts and enclosures — working remotely, with your designs printed, machined, and tested on real robots in our San Francisco lab.

**You will:**

* Design robot parts, enclosures, and covers in CAD for 3D printing, CNC, and sheet metal
* Package cameras, sensors, compute, actuators, and wiring into clean, serviceable assemblies
* Own designs from concept through prototype, assembly feedback, and revision
* Produce CAD geometry clean enough to feed our simulation and testing pipeline
* Iterate fast: you design remotely, we build in SF, and you get feedback from real robots within days

**You have:**

* Strong CAD fundamentals — parametric modeling, assemblies, tolerancing, DFM
* Hands-on prototyping experience: you've printed, machined, assembled, and fixed your own designs
* A feel for designing around electronics, cabling, and moving joints
* Clear async communication — you can drive a design loop remotely
* **Nice to have:**
* Experience with robot arms, grippers, or mobile platforms
* Industrial design sensibility for exterior covers and finishes
* Option to convert to full-time. In-person interns are welcome to apply as well, provided they have CAD experience.

Skills:

CAD Design