Senior Prototype Engineer

Here at Humanoid, we believe in a future where robots amplify human potential. That’s why we’ve set out on a mission to build the world’s most capable, commercially-scalable, and safe humanoid robots. We’re bringing that mission to life with HMND‑01 - our rapidly developed humanoid platform being deployed in real industrial environments - and we’re growing the team to take it even further.

We're hiring a Senior Prototype Engineer to join our Hardware team based in Boston. This is a hands-on role where you will rapidly iterate, assemble, diagnose, and evolve advanced robotic platforms for real-world use.

• Lead troubleshooting and resolution of complex electrical issues in prototype humanoid robots, including operational and in-development systems; perform detailed failure analysis and share learnings with hardware/software engineering teams.

• Collaborate closely with multidisciplinary engineers on prototype design, assembly, and bring-up, especially high-density electromechanical integrations.

• Create, maintain, and execute clear test procedures, troubleshooting guides, and repair runbooks for the prototyping lab to ensure high standards and rapid iteration cycles.

• Design, document, and iterate on cable assemblies, test jigs, and harnesses optimized for repeated use on dynamic robotic platforms.

• Identify and own opportunities for continuous process and product improvement—minimizing downtime and improving test/repair efficiency.

• Contribute to robust feedback loops across design, build, and test, driving first-pass yield and manufacturability.

• Demonstrated experience in rapid physical prototyping, hands‑on debug of custom hardware, and troubleshooting complex electrical systems in robotics or similar domains.

• Working knowledge of low-voltage and mixed‑signal circuits, connectors, sensors, and compact electromechanical systems.

• Track record communicating concisely via documentation—procedures, test plans, diagnostics, and lessons learned.

• Adept collaborating across mechanical, electrical, and software engineering boundaries to solve urgent, ambiguous issues.

• Comfortable in a high‑velocity, high‑ambiguity startup setting where priorities shift fast.

• Experience designing for manufacturability and reliability in the context of human‑sized or mobile robotics is a plus.

• Familiarity with automated test and diagnostic tools used in modern hardware labs.

• Comprehensive health coverage for US‑based employees, including fully paid medical, dental, and vision insurance, with virtual care and employee assistance resources.

• Meaningful time off to rest and recharge: 23 days of PTO (accrued), separate sick leave, and paid company holidays.

• 401(k) retirement plan with 4% employer match.

• Equity included–we believe builders should share in what they build.

• Free daily catered lunch, snacks, and drinks in‑office.

• Collaboration with top‑tier engineers, researchers, and product experts in AI and robotics.

• Freedom to influence the product and own key initiatives.

For this role in Massachusetts, the expected base salary range is $115K–$160K USD per year; your placement in that range depends on how your experience maps to our internal leveling.