Apptronik is a human-centered robotics company developing AI-powered robots to support humanity in every facet of life. Our flagship humanoid robot, Apollo, is built to collaborate thoughtfully with people, starting with critical industries such as manufacturing and logistics, with future applications in healthcare, the home, and beyond. We operate at the cutting edge of Applied AI, applying our expertise across the full robotics stack to solve some of society's most important problems. You will join a team dedicated to bringing Apollo to market at scale, tackling the complex challenges like safety, commercialization, and mass production to change the world for the better. JOB SUMMARY We are seeking a Staff Test Engineer – Actuation to own the design verification and NPI test process for Apptronik's custom actuator systems. This is a hands-on, multi-disciplinary role spanning mechanical, electrical, firmware, and software testing — requiring someone who can independently drive actuator characterization and validation from initial bringup through design verification, and build the test methods and automation that transfer to test ops as programs move into production. You will design and execute actuator test campaigns, develop robust bringup and calibration workflows, diagnose hardware issues across the full electromechanical stack, and deliver validated, well-documented test processes that are ready for handoff. You will work closely with mechanical, electrical, firmware, and controls engineers — connecting test data to root-cause analysis and hardware design improvements. KEY RESPONSIBILITIES • Actuator Bringup & Calibration: Lead the bringup process for new actuator hardware — including firmware deployment, motor and encoder calibration, and functional verification. Develop documented, repeatable procedures that can be transferred to test ops for production use. • Design Verification Testing: Plan and execute tests to confirm performance against requirements. Work with design engineering to characterize actuator performance across the operating envelope. Tests span mechanical (e.g., efficiency, stiffness, backlash, life), electrical (e.g., peak current, thermal limits, drive performance), and system-level (e.g., positional accuracy, off-axis loading, effort production) domains. Highlight and resolve gaps in requirements / test plans. • Test Method Development for Production: Work with the Manufacturing Test team to design and validate the production test methods used during NPI. • Test Equipment Operation: Operate and configure dynamometer, benchtop, and custom test setups. Manage fixture configurations and load motor modes across different actuator and gearbox variants. • Failure replication, root cause analysis, design feedback: Replicate failures and feed clear bugs to the design engineering team. Root cause failures when possible and provide design recommendations to improve performance and design for testability. • System Identification: Apply system identification techniques to characterize actuator dynamics — including inertia, friction, bandwidth, and torque constant — providing data that supports both hardware validation and simulation fidelity. SKILLS AND REQUIREMENTS Required Qualifications • Direct hands-on experience testing and characterizing actuators, motors, or gearboxes — including operation of dynamometer or motor test stand systems. • Experience with motor bringup and calibration workflows, with enough firmware and electrical fluency to diagnose calibration and drive faults independently. • Strong cross-disciplinary debugging ability across mechanical, electrical, and firmware domains. • Demonstrated experience designing test methods and procedures — including pass/fail criteria and handoff documentation — not just executing pre-written scripts. • Ability to read and interpret electrical schematics, mechanical drawings, and motor datasheets. • Experience working in multi-disciplinary hardware teams with fast iteration cycles. • Comfortable operating at staff level: leading technical workstreams, influencing engineering decisions with data, and mentoring others. • Experience transitioning test methods from R&D into production or manufacturing environments. Preferred Qualifications • Experience with humanoid or legged robot actuator systems. • Familiarity with thermal modeling and thermal test methods for electric motor systems. • Knowledge of motor drive electronics, power electronics, and power stage design margins. • System identification background: frequency-domain analysis, bandwidth measurement, and dynamic model extraction. • Simulation experience (MuJoCo, Isaac Sim/Lab, etc.) and sim-to-real validation workflows. • Docker, scripting, or infrastructure tooling for test automation at scale. EDUCATION AND/OR EXPERIENCE • BS in Mechanical Engineering, Electrical Engineering, Robotics, Computer Science, or related field + 6 years of relevant experience, OR • MS in related field + 4 years of relevant experience, OR • PhD in related field + 2 years of relevant experience. Candidates with non-traditional backgrounds who can demonstrate equivalent hands-on experience with actuator testing and robotic hardware bringup are strongly encouraged to apply. PHYSICAL REQUIREMENTS • Prolonged periods of sitting at a desk and working on a computer. • Must be able to lift 15 pounds at times. • Vision to read printed materials and a computer screen. • Hearing and speech to communicate.     *This is a direct hire.  Please, no outside Agency solicitations.  Apptronik provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.