Senior Prototype Engineer

About the role

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.

About the Role

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.

What You’ll Do

• 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.

What We're Looking for

• 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.

What We Offer

• 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.