Staff Firmware Engineer - Motor Controls

Employer description

About 1XWe’re building humanoid robots that work in home - doing the chores, handling the tasks, and giving people their time back. Simple, but it’s not.

To do this right, we have to solve robotics, AI, manufacturing - at the same time, at scale, in a form factor that has to be safe enough to live with your family. If you’re inspired by this, you’ll thrive here. We’ve been at this since 2014 and we’re at the point where the hard problems are behind us and the hard work is in front of us.

NEO is our flagship - a home robot designed to move, learn, and operate in the real world alongside real people. We’re not demoing it - we’re shipping it. We’re excited to meet you, if this excites you.

If you’ve spent your career working on problems that matter and want to see them actually reach the world - this is that moment. We’re scaling, we’re hiring with intention, and we need people who want to build something that will genuinely change how humans spend their time - safely creating abundance for all.

About the TeamThe Firmware team owns the embedded software layer that powers every hardware subsystem of our humanoid robot from distributed communication bus architecture and power management to actuator and motor drive control. We sit at the intersection of hardware and software, and our work is directly on the critical path to every product milestone: without reliable firmware, the robot cannot move, charge, or operate safely. If you want to build the foundational software for a new category of physical AI, this is where that work happens.

Your CharterOwn the motor control firmware that turns current into motion in every joint of NEO, and make it robust, safe and maintainable. Your control loops decide how smooth, quiet and compliant NEO feels around people, and how fast the team can move as the actuator platform grows.

Key OutcomesDevelop motor control firmware for BLDC/PMSM actuators, including field-oriented control (FOC), space-vector PWM, and current, velocity and position loops

Integrate and calibrate position sensing: absolute and incremental encoders, Hall sensors, commutation offsets and multi-turn tracking

Tune control loops for high bandwidth, low torque ripple and low acoustic noise, including feedforward, friction and cogging compensation

Implement torque and impedance control modes that support safe, compliant interaction with people

Build fault detection and protection for overcurrent, overvoltage, undervoltage, overtemperature, stall and sensor failures, with safe torque-off behavior

Design motor drive communication with deterministic timing to the central controller

Bring up new motor driver boards and support hardware design reviews for gate drivers, current sensing and power stages

Test and validate firmware releases on the bench and on full robots, and build tools for automated tuning, logging and regression testing

Key CompetenciesStrong embedded instincts: you write control code that stays correct under real hardware conditions, including ISR timing, ADC sampling alignment, PWM edge cases and DMA conflicts

First-principles debugging: you find root causes at the hardware-firmware boundary with a scope, current probe and an understanding of motor physics

Safety-first mindset: you treat fault handling, current limits and safe torque-off as core firmware, not an afterthought

Clear cross-functional communication: you explain control and firmware constraints to electrical and actuator engineers, and pull in early during hardware design

Minimum Requirements:5+ years of embedded firmware development in C/C++ (7+ for senior roles)

Shipped motor control firmware for BLDC or PMSM motors, including FOC and cascaded control loops

Solid grasp of motor physics and power electronics: inverters, gate drivers, current sensing, dead time and PWM

Experience with encoders and sensor interfaces such as SPI, BiSS-C, SSI or ABZ

Hands-on experience with EtherCAT/CAN or another real-time fieldbus

Comfort with interrupt-driven, hard real-time code on MCUs such as STM32, TI C2000 or similar

Hardware debugging with oscilloscopes, current probes, logic analyzers and dynamometers

Preferred SkillsExperience with robotic joints, quasi-direct-drive or high-ratio geared actuators

Background in sensorless control, field weakening or motor parameter identification

Experience with EtherCAT or CAN FD at high update rates (1 kHz and above)

Experience with safety-critical systems or standards such as IEC 61508, ISO 13849 or ISO 26262, including functional safety concepts like STO

Familiarity with a real-time OS such as FreeRTOS, SafeRTOS or Zephyr

Modeling and simulation in MATLAB/Simulink or Python for controller design

Robotics or autonomous systems background

What does a successful 1X Team Member look likeTeam members at 1X who thrive here are builders. They move fast, own their work completely, and treat time like it’s the one thing you can’t get back - because it is. They say what they mean, finish what they start, and hold themselves to a standard before anyone has to ask. We push each other to be better, and we do it with honesty and respect.

BenefitsSalary Range: $200,000 – $300,000 + Equity

Health, dental, and vision insurance

401(k) with company match

Paid time off and holidays

Equal Opportunity Employer1X is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender, gender identity or expression, sexual orientation, national origin, ancestry, citizenship, age, marital status, medical condition, genetic information, disability, military or veteran status, justice system impact, or any other characteristic protected under applicable federal, state, or local law.