Senior Actuator Mechanical Design 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 Alpha - our rapidly developed humanoid platform now running in real industrial pilots - and we’re growing the team to take it even further.

About the Role

As a Senior Mechanical Design Engineer at Humanoid, you will own the design and development of key mechanical subsystems, including robotic joints, actuators, structural assemblies, and dynamic mechanisms that enable humanoid mobility and manipulation.
This role requires strong fundamentals in mechanical design, system integration, and GD&T (ASME Y14.5), as well as a passion for building complex hardware systems.
You will collaborate closely with robotics, controls, electrical, and software teams to rapidly prototype, test, and deploy robotic hardware.
Your work will directly influence the performance, reliability, and scalability of our humanoid robots.

What You’ll Do

• Design and develop mechanical systems for humanoid robots, including structural components, joints, actuators, and robotic linkages

• Create 3D CAD models and production drawings using SolidWorks / NX, applying GD&T (ASME Y14.5) to ensure precision and manufacturability

• Design robotic mechanisms and linkages optimized for strength, weight, efficiency, and durability

• Select materials and manufacturing methods that balance performance, weight, cost, and scalability

• Lead rapid prototyping and iteration, using tools such as 3D printing, CNC machining, and rapid fabrication

• Work closely with electrical, controls, and software engineers to integrate motors, sensors, and embedded systems into robotic platforms

• Conduct mechanical testing and validation to verify performance, durability, and system reliability

• Perform design reviews, risk assessments, and safety analysis to ensure robust robotic systems

• Generate and maintain technical documentation, including engineering drawings, specifications, and bill of materials (BOM)

• Own mechanical subsystems from concept through prototyping, testing, and deployment

We’re Looking For

• 5+ years of professional experience in mechanical design for robotics, electromechanical systems, or complex hardware products

• Bachelor’s or Master’s degree in Mechanical Engineering, Robotics, Mechatronics, or a related field

• Strong fundamentals in mechanics, statics, dynamics, and material science

• Proficiency with SolidWorks or similar CAD tools

• Experience applying GD&T based on ASME Y14.5

• Experience designing precision mechanical assemblies or mechanisms

• Familiarity with manufacturing processes such as CNC machining, additive manufacturing, and injection molding

• Hands‑on experience building, assembling, and testing mechanical prototypes

• Strong analytical and problem‑solving skills

• Ability to work effectively in a fast‑paced, multidisciplinary engineering environment

Bonus Qualifications

• Experience developing robotic or mechatronic systems

• Experience designing robotic actuators, gear trains, or transmission systems

• Experience working on humanoid, legged, or mobile robots

• Experience performing FEA or structural simulations

• Experience designing lightweight structural systems

• Familiarity with robotic safety standards such as ISO 10218

• Experience in robotics, aerospace, automotive, or advanced hardware startups

What We Offer

• Competitive salary plus participation in our Stock Option Plan

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

• Freedom to influence the product and own key initiatives.

• Ability to solve some of the most complex systems engineering challenges in robotics.

• Meaningful time off to rest and recharge: 23 days of annual leave (accrued), 15 days of paid sick leave, and paid company holidays.

• Comprehensive extended health benefits starting on your first day, including fully paid medical and dental, virtual care, employee and family assistance, and worldwide emergency medical support.

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