Senior Algorithms and Simulation Software Engineer
Cfsenergy, Devens, MA
- Pay
- $107K–$160K / year
- Work type
- Hybrid
- Level
- Senior
- Area
- Software engineering
- Posted
- Aug 20, 2026
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About the role
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 Algorithms and Simulation Software Engineer
In this role you will be responsible for the design and implementation of state estimation and control algorithms, plus models and simulation frameworks necessary to verify those algorithms. Your algorithms will be used in critical real-time applications in the SPARC project, as well as related projects.
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 mission-critical state estimation and control algorithms
- Develop software infrastructure to operate Hardware-in-the-Loop (HITL) and software-only testbeds
- Develop simulation models and model infrastructure for both real-time and offline (high fidelity) simulations
- Develop offline data analysis tools
- Help define and execute end-to-end and other integrated test cases and test plans to validate SPARC control software
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 writing real-time state estimation and control algorithms
- 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 Hardware-in-the-Loop testbeds and software-only testbeds for validating control software
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Listed on Cfsenergy's Lever job board; checked 5 h ago. First seen by us 33 h ago. Being listed doesn't mean the team is actively interviewing. We found this board in a public directory and haven't yet confirmed it against the company's own careers page.