Senior Embedded Software Engineer

Commonwealth Fusion Systems LLC; Massachusetts; On-site; USD 140,000 - 200,000; Full time

Benefits offered by this job

Equity compensation

Company holidays

Flexible vacation

Sick days

Parental leave

Health insurance

Dental insurance

Vision insurance

401(k) matching

Professional growth

Team building

Job summary

Commonwealth Fusion Systems is seeking a Senior Embedded Software Engineer to design, implement, and verify software for advanced R&D equipment and complex machinery. You will write production‑quality real‑time code and collaborate with a cross‑functional team to deliver robust software solutions.

You will contribute to integration with testbeds, tooling, and production systems, while leveraging real‑time Linux, microcontrollers, and FPGAs.

Qualifications

• 7+ years of relevant experience in embedded, real‑time control systems.
• Production‑quality control software development experience.
• Experience with CI/CD and Git workflows.
• Proficiency in Python and at least one real‑time control language (C++, Rust).

Responsibilities

• Develop control software across multiple platforms, including real‑time Linux, microcontrollers, and FPGAs.
• Verify embedded software with Hardware‑in‑the‑loop testbeds and field commissioning activities.
• Improve software tooling to increase developer velocity and enable new capabilities.

Skills

Python

C++

Rust

CI/CD

Git version control

Unit testing

Integration testing

Education

Bachelor's degree in relevant engineering field

Tools

Real-time Linux

Microcontrollers

FPGAs

Job description

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, we’re designing and building commercially viable fusion power plants. And we're working with policymakers, suppliers, and many others to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading fusion company in the world.

Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team.

If that’s you and this role fits, we want to hear from you.

Join the power movement as a Senior Embedded Software Engineer

As a Senior Embedded Software Engineer, you will be responsible for the design, implementation, and verification of software and controls for advanced R&D equipment and complex machinery.

As a member of the Software Engineering team, you will be a hands-on technical contributor. You will be a champion of writing excellent quality, production‑ready code for mission‑critical real‑time systems. You will collect functional requirements from customers and produce software solutions to meet these requirements.

You will work with a variety of engineers to integrate your software into software testbeds, hardware testbeds, and the production tools. You will also contribute to the broader software ecosystem to improve tooling and processes used across the company.

What you'll do:

• Develop control software across multiple platforms, including real‑time Linux, microcontrollers, and FPGAs
• Verify embedded software with Hardware-in-the-loop testbeds and field commissioning activities
• Improve software tooling to increase developer velocity and enable new capabilities

What we’re looking for:

• Bachelor's degree in a relevant engineering field (computer science, computer engineering, electrical engineering, industrial engineering, etc.)
• 7+ years relevant experience
• Professional experience with embedded, real‑time control systems
• Professional experience with producing production quality control software
• Experience with modern software development lifecycle practices (CI/CD, git version control, unit testing, integration testing, etc)
• Proficiency with python
• Proficiency with at least one real‑time control language (c++, rust, etc)

Bonus points for:

• Experience with mission or safety critical systemsExperience with large-scale industrial systems
• Experience with large-scale industrial systems
• Familiarity with real‑time Linux
• Familiarity with bare‑metal micro controllers
• Familiarity with FPGA development
• Familiarity with common I/O protocols (SPI, CAN, serial, etc)
• Familiarity with general networking (IP/UDP)

Must-have Requirements:

• Perform activities such as typing, standing, sitting, etc. for extended periods of time
• Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics
• Willingness to occasionally travel or work required nights/weekends/on‑call

$140,000 - $200,000 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‑Hybrid

At CFS, we excel in fast‑paced environments, driven by our values of integrity, execution, impact, and self‑critique. As we grow, we’re 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.