Senior Power Electronics Firmware Engineer at tonaltonal · San Francisco, CA

Type: fulltime

Posted: 2026-11-05

Skills: Python, CI/CD, AccessibilityOVERVIEW Tonal is looking for a Senior Power Electronics Firmware Engineer to develop the firmware for our motor drive and power systems. That drive generates up to 250 pounds of digital weight, so its firmware defines how Tonal feels to every member. You’ll contribute at every stage, from concept, prototyping, and bring-up through validation and high-volume production. You’ll join the Firmware team in our Hardware department, working closely with electrical, mechanical, and software engineers. Together, you’ll tackle challenges that span motor control, power conversion, thermal limits, and member safety. Our team offers a rare chance to shape the core technology of a new fitness category. WHAT YOU WILL DO - Develop and improve motor control and power management firmware that makes Tonal’s digital weight feel smooth and responsive - Add and maintain protection features, such as overcurrent and overtemperature handling, that keep members safe - Bring up and debug new boards in the lab with the electrical team - Test and tune motor performance, and help build the tools and automated tests that validate each release - Support manufacturing test and calibration, and help investigate issues from the field - Work with software, mechanical, and product teams to turn member feedback into firmware improvements - Take part in design and code reviews, and help improve how the team builds and ships firmware WHO YOU ARE - 5+ years of embedded firmware development, including 3+ years focused on motor control or power electronics - Expert C development for real-time, resource-constrained systems; experience in C++ and Python is also valuable - Experience developing multithreaded firmware on an RTOS, including scheduling, synchronization, and interrupt handling for timing-critical tasks - Hands-on experience implementing FOC for PMSM/BLDC motors, including current-loop tuning and sensored or sensorless position estimation - Solid power electronics fundamentals: inverters, DC-DC con…Sign in to see the original postingBrowse more developer jobs on RoleBurst