Real-Time Software Engineer
Commonwealth Fusion Systems
Software Engineering
Milpitas, CA, USA
Posted on Apr 19, 2025
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 working with policymakers and suppliers to build the energy industry of the future.
We’re in the best position to make it happen. Since 2018, we’ve raised over $2 billion in capital – more than any other fusion energy company in the U.S.
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 Real-Time Software Engineer
The Real-Time Software Engineer will be responsible for the design, debug, and implementation of the software and controls of advanced R&D equipment and complex machinery.
As a member of the controls software team you will be a hands-on technical contributor, 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 simulation and test engineers to integrate your software into software testbeds, hardware testbeds, and the production tools.
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.
What you'll do:
- Work within a multi-disciplinary and proven team of top scientists and engineers
- Specify, write, and test control software for advanced production equipment
- Own the specification, design, testing, and implementation of key systems such as interlocks, sensors and actuators, higher level tool control and user interface programming
- Work closely with process team to outline interfaces and requirements for equipment and software operation for equipment control
- Engage with mechanical and electrical engineers on concepts, designs, and test plans by providing data acquisition and controls as needed
- Work with external software contractors to develop the control systems for internal production tools (Define requirements, manage priorities, drive testing and implementation plans)
What we’re looking for:
- A bachelor’s degree in a relevant engineering field (e.g., mechatronics, software)
- 3+ years of experience as software engineer on complex mechanical systems -- for example: design, construction, and operation of controls for industrial, large-scale equipment
- Working knowledge of Python, C++, C and other high level languages along with modern tools like github and CI/CD release management
- Experience with developing control loops, physics-based modeling, or simulation platforms
- High self-motivation and drive to execute quickly with excellent troubleshooting and problem-solving skills
Bonus points for:
- Experience with GUI development using tools such as Ignition
- Knowledge of fieldbus systems (like EtherCAT)
- Networking basics (IP/UDP/TCP)
- Real-time system software development experience
- Familiarity with Linux environments
- Exposure to safety interlock systems or standards like NFPA 79 and SEMI S2
- Design for manufacturability, serviceability, and simplicity over complexity
Must-have Requirements:
- Ability to occasionally lift up to 50 lbs
- Perform activities such as stooping, climbing, standing, or sitting 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, and cryogenics
- Willingness to travel or work required nights/weekends/on-call occasionally
#LI-Onsite
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.