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Senior RF Test Engineer
Job Location:
Job Location:
Devens, MA - USA
Yearly Salary:
USD 110000 - 185000
Yearly Salary:
Posted:
29 September 2026 (Yesterday)
Posted:
Application Deadline:
27 December 2026
Application Deadline:
Vacancies:
1 Vacancy
Vacancies:
Job Summary
About Commonwealth Fusion Systems:
Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.
Combining decades of research top talent and new technologies were designing and building commercially viable fusion power plants. And were working with policymakers suppliers and many others to build the energy industry of the future.
Were in the best position to make it happen. Since 2018 weve raised $4 billion of capital making us the largest and leading fusion company in the world.
Now were looking for more thinkers doers builders and makers to join us. People wholl bring new perspectives solve tough problems and thrive as part of a team.
If thats you and this role fits we want to hear from you.
Join the power movement as a Senior RF Test Engineer
SPARC sustains fusion reactions by feeding >25MW of 120MHz RF power into the tokamak to heat the plasma to 100 million Kelvin. We need an RF Test Engineer to play a pivotal role in validating and testing the electronics and control systems that power the most ambitious RF plant in the world.
At this level you are a hands-on executor and technical problem solver. You will be directly responsible for taking newly architected RF and power electronics from the benchtop to full-scale operation. Your day-to-day will span board-level bring-up operating high-power RF transmitters and integrating hardware with software controls to ensure SPARC achieves net energy.
For more information on the SPARC RF plant see the SPARC journal papers here:
What youll do:
- Execute Board-Level Bring-Up: Lead the initial power-on debugging and validation of custom printed circuit board assemblies (PCBAs) embedded digital controllers and low-level electronics focusing heavily on the integration of these boards into working modular solid-state RF systems
- Operate RF Transmitters & High Voltage Systems: Safely run and test high-power RF transmitters with a primary focus on validating and troubleshooting complex RF behaviors. You will also safely interface with and occasionally troubleshoot the supporting high-voltage infrastructure and large-scale supercapacitor banks
- Drive Hardware/Software Integration: Bridge the gap between physical electronics and control software ensuring that measurement circuits timing systems and sensors interface seamlessly with SPARCs central data collection and control networks
- Oversee FAT Fixturing & Operation: Design assemble and manage the fixturing for Factory Acceptance Testing (FAT). You will oversee the execution of these tests to validate that incoming hardware meets stringent performance and safety criteria
- Develop Procedures & Hand-Off: Translate complex engineering validation steps into clear repeatable test procedures ultimately training and handing off routine testing and steady-state operations to engineering technicians
What were looking for:
- Bachelors degree in Electrical Engineering Physics or a related field
- 7 years of hands-on experience testing high-power RF systems radar particle accelerators electric vehicles or heavy industrial power electronics
- Proven hands-on experience safely working with high voltage components energy storage (e.g. supercapacitors) and troubleshooting complex analog and digital circuits at the component level
- Exceptional skills in reading RF circuit designs (Altium or similar) and setting up automated test environments to validate sensitive timing and RF detection circuits within extreme high-power high-noise environments (EMI/EMC mitigation)
- Proficiency in C and Python with the ability to read code and thoroughly understand software deployments before testing them
- Proven intuition for high-power RF environments
Bonus points for:
- Experience designing test fixtures writing comprehensive FAT protocols and setting up automated data acquisition systems in high-noise environments utilizing EMI/EMC mitigation techniques to ensure circuits operate reliably
- Hands-on experience measuring forward and reflected RF power diagnosing RF arcs and validating the timing and electronics designed to mitigate them
- Proven experience writing custom test software to automate lab equipment and validate system functionality
- A strong systems-level understanding of modern high-performance embedded digital controllers high-speed communications and fundamentals of mechanical/thermal design to safely execute tests and interface effectively with cross-functional teams
Must-have Requirements:
- Ability to lift up to 50lbs
- Perform activities such as stooping climbing standing typing or sitting for extended periods of time
- Willingness to travel or work required nights/weekends/on-call occasionally
- Work in a facility that contains industrial hazards including heat cold noise fumes strong magnets lead (Pb) high voltage high current pressure systems and cryogenics
$110000 - $185000 a year
Salary range for this full-time position equity benefits.The actual salary will depend on level location qualifications and experience. The range displayed on each job posting reflects new hire salaries for the position across all US locations.
Benefits include:
Competitive compensation with equity
13 Company-wide Holidays
Flexible vacation days
10 sick days
Generous parental leave policy
Health dental and vision insurance
401(k) with employer matching
Professional growth opportunities
Team-building activities
#LI-Onsite
At CFS we excel in fast-paced environments driven by our values of integrity execution impact and self-critique. As we grow were eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.
We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally regardless of race color national origin ancestry citizenship status protected veteran status religion physical or mental disability marital status sex sexual orientation gender identity or expression age or any other basis protected by law.
This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively Export Control Laws). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.
Required Experience:
Senior IC
