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Senior Power Electronics Firmware Engineer

Engineering | Hybrid in Longmont, CO | Full Time | From $175,000.00 to $180,000.00 per year

Job Description

At FreeWire, we fundamentally change the way businesses and utilities electrify. We build battery-based energy storage systems that provide clean and quiet power anywhere it’s needed, reducing the cost and accelerating deployment of electric vehicle charging infrastructure. FreeWire’s solutions are evolving from providing ultrafast EV charging services to a full suite of energy services to accelerate sustainable electrification and provide resiliency to customers and a distributed power source to utilities. FreeWire has secured major strategic investors from Fortune 100 companies and serves leading corporate, utility, and retail customers. The feedback on the Boost Charger, FreeWire’s DC fast charger, has been overwhelmingly positive as we electrify locations that would have been too expensive to power on using conventional charging solutions. Utilities are releasing RFPs with requests for battery backed solutions, their regulatory teams are including our technology as eligible for incentives, and they are seeking cost effective solutions as they electrify their fleets and provide utility owned charging solutions for the public.  

FreeWire has deployed battery-integrated chargers with Fortune 100 companies, commercial customers, fleets, retail locations, and gas stations. In addition to its partnership with bp pulse, FreeWire and ampm, a bp subsidiary and convenience store chain with over 1,000 locations, have already deployed multiple public charging stations in the U.S. FreeWire’s regulatory affairs and policy team keeps customers up to date on federal, state, and utility incentive opportunities, which in some cases cover up to 80% of the cost of the charging station, and the company recently announced that the Boost Charger is Buy America compliant. Learn more at and follow us @FreeWireTech.

Senior Power Electronics Firmware Engineer
Location: Longmont, CO or Newark, CA


  • Modeling and simulation of advanced topologies of power electronics circuits like DC-DC and AC-DC converters using the modeling software packages: PLECS and Matlab modeling tools
  • Develop design requirements and methodology for developing future FreeWire power electronics topology and control strategy
  • Develop a power electronics control algorithms and embedded C programming on TI microcontroller platforms for high-speed switching frequencies (100kWhs) for switch-mode power supplies
  • Be involved in model validation by using experimental setup and lab/field testing
  • Bench testing of power electronics circuits, using oscilloscope, power supplies, and other industrial equipment up to 250kW and 3phase 460Vac/1000Vdc             
  • Data analysis of results from bench/field testing


  • Experience with design and layout of switched-mode power converter circuits, including magnetics design, analog sensor circuitry, and signal conditioning, as well as microcontroller communication interfaces with schematic generation and layout in Altium Designer     
  • Previous experience with automotive applications, battery chargers, grid interactive inverters, as well as knowledge of industrial compliance like: UL, CSA, IEC, FCC, etc.
  • Experience with designing magnetics for power converters (HF planar magnetics)
  • Experience with Embedded C programming for power electronics (ADCs, IOs, display, SPI, etc.)

Bonus Points:

  • A graduate level degree in Electrical Engineering, with a focus in power electronics (PhD degree is preferred)
  • Experience with power circuit board designs (designed and built at least one power board for 100A+ current using Altium, Eagle or similar tools)
  • Experience with power bench testing and equipment – voltage/current measurement, DC/DC power supplies, power resistors, and motor drives for up to 480Vac/1000Vdc      


FreeWire offers competitive benefits, including:

  • Health, Dental & Vision Insurance
  • Short- & Long-Term Disability Insurance
  • Life Insurance
  • Unlimited PTO
  • Dog Friendly

At FreeWire Technologies, we offer fair and equal opportunities to all our candidates and team members regardless of race, color, religion, sex, pregnancy, sexual identity, national origin, citizenship, marital status, disability status, parental status protected veteran status, or any other characteristics protected by law. FreeWire Technologies believes in hiring individuals only based on their qualifications and experiences that meet our business requirements to fill the positions.