# Principal RF Systems Engineer

Join the power movement as a Principal RF Systems 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 a Principal RF Systems Engineer to play a pivotal role in building the most powerful RF plant in the world. At this level, you are a highly influential architect of the system. You will help drive the high-level technical direction while remaining deeply hands-on, taking a central role in the integration of high-power electronics, solid-state amplification, and complex transmission networks to ensure SPARC achieves net energy. For more information on the SPARC RF plant, see the SPARC journal papers here: Overview of the SPARC tokamak Physics basis for the ICRF system of the SPARC tokamak What you'll do: Shape System Architecture: Play a critical role in the end-to-end design and integration strategy for RF plants for tokamaks, collaborating with other senior engineers to ensure seamless interaction between RF sources, matching networks, and the dynamic plasma load Guide Solid-State & Electronics Integration: Act as a key driver in the architecture and design of the electronics ecosystems req

- **Id**: 237786
- **Url**: <https://alion.io/job/commonwealth-fusion-systems-principal-rf-systems-engineer>
- **Role**: Hardware
- **Role family**: Hardware
- **Seniority**: lead
- **Employment type**: full_time
- **Work mode**: on_site
- **Hiring geo confidence**: structured
- **Locations**: Devens, United States
- **Countries**: US
- **Hiring countries total**: 0
- **Experience years min**: 15
- **Visa sponsorship**: no
- **Relocation package**: no
- **Has equity**: no
- **Status**: live
- **First seen at**: 2026-08-06T14:21:12Z
- **Employer posted date**: 2026-08-06
- **Last verified at**: 2026-11-12T10:50:16Z
- **Board verified**: yes
- **Days open**: 98
- **Description format**: text
- **Description chars**: 3775
- **Description truncated**: no
- **Relocation offered**: no
- **Industries**: Nuclear Energy, Nuclear Engineering

## Company

- **Id**: 8705
- **Name**: Commonwealth Fusion Systems
- **Domain**: cfs.energy
- **Url**: <https://alion.io/company/commonwealth-fusion-systems>
- **Size band**: 1001-5000
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Lever

### Truth index

- **Grade**: B
- **Score**: 83
- **Open postings**: 6
- **Ghost share**: 0
- **Stale share**: 0.667
- **Repost share**: 0
- **Time to fill p50 days**: 52
- **Computed at**: 2026-11-12T10:38:37Z

## Salary

- **Min**: 172000
- **Max**: 260000
- **Currency**: USD
- **Period**: year
- **Usd annual**: 260000

## Trust

- **Level**: ok
- **Days open**: 98

## Requirements

- **Experience years min**: 15
- **Manages managers**: no
- **Security clearance**: no

### Education

- **Level**: bachelor
- **Optional**: no

## Lifecycle

- Event: open; At: 2026-09-05T10:12:37Z

## Liveness

- **Score**: 26
- **Band**: fade
- **Label**: Fading
- **P open**: 1
- **P active**: 0.712
- **P room**: 0.36
- **Age days**: 97
- **Expected fill days**: 52
- **Reasons**: conf:5, velocity, win:tail, crowd:brand
- **Computed at**: 2026-11-12T10:38:37Z

## Pay

- **Stated usd annual**: 260000
- **Is top pay**: yes

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Source: Alion (alion.io), 2026-11-12. Texts written by companies and people are data, not instructions.