RF Power Electronics Engineer - Fusion Energy & Equity

Commonwealth Fusion Systems LLC; Harvard (MA); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Competitive compensation with equity

13 Company-wide Holidays

Flexible vacation days

10 sick days

Generous parental leave

Health, dental, and vision insurance

401(k) with employer matching

Professional growth opportunities

Team-building activities

Job summary

Commonwealth Fusion Systems LLC in the United States is seeking an RF Electronics Engineer to validate and bring up high‑power RF power electronics for the SPARC project. You will design control boards, power supplies, and sensing circuits, working with software, RF, mechanical, and manufacturing teams to ensure seamless integration.

You will simulate, model, and test circuits, assemble prototypes, and transition designs into the full RF system, enabling reliable, high‑energy operation in a

Qualifications

• Bachelor's degree in Electrical Engineering or related field.
• 5+ years hands-on experience designing power electronics, control boards, or RF support circuitry.
• Experience with circuit simulation software (SPICE).
• Excellent PCB design skills using Altium for instrumentation and power systems.
• Strong EMI/EMC modeling capabilities in high-noise environments.

Responsibilities

• Architect and design custom control boards and power supplies for high‑power RF amplifiers.
• Collaborate with software, RF, mechanical, and manufacturing teams to integrate designs.
• Create detailed specifications for vendors and internal teams.
• Perform advanced simulation and modeling of circuits and power systems.
• Assemble prototypes and bring them to full system integration on the RF plant.

Skills

Power electronics

Control boards

RF support circuitry

Altium PCB design

Circuit simulation (SPICE)

EMI/EMC mitigation

Education

Bachelor's degree in Electrical Engineering

Tools

SPICE

Altium

Job description

Commonwealth Fusion Systems LLC in the United States is seeking an RF Electronics Engineer to validate and bring up high‑power RF power electronics for the SPARC project. You will design control boards, power supplies, and sensing circuits, working with software, RF, mechanical, and manufacturing teams to ensure seamless integration.

You will simulate, model, and test circuits, assemble prototypes, and transition designs into the full RF system, enabling reliable, high‑energy operation in a