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Senior Control Software Engineer

Commonwealth Fusion Systems • Nuclear Energy • Nuclear Engineering • Travel required • Bachelor's Degree • Python • Rust • C++ • 4 months ago

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Salary

$140k – $200k per year

Location

Hybrid (Devens, United States)

Seniority

Senior

Employment

Full-Time

Confirmed on the employer's own hiring board on Oct 17, 2026. First seen by Alion on Jun 23, 2026. Commonwealth Fusion Systems scores A on the Alion truth index.

Overview

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Profile match

Commonwealth Fusion Systems

Commonwealth Fusion Systems is a commercial fusion energy company headquartered in Devens, Massachusetts, and founded in 2018. The firm specializes in the development of high-temperature superconducting magnets and compact tokamak devices, specifically the SPARC net-energy machine and the ARC commercial power plant. It operates through a strategic partnership with the Massachusetts Institute of Technology and focuses on scaling fusion technology to provide carbon-free, baseload power to global energy markets.

cfs.energy • HQ: Devens, United States • Nuclear Engineering • Nuclear Energy • 1001-5000 employees • Est. 2018

Tech stack of Commonwealth Fusion Systems

Backed by Coatue, Khosla Ventures, Silicon Valley Investclub

Join the power movement as a Senior Control Software Engineer

As a Control 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, 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 PLCs and real-time Linux
Develop operator interfaces and workflows
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.)
Several years of experience with industrial control systems and/or embedded control systems
Several years of experience in producing production quality control software
Working knowledge of 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++, SCL/ST, Rust, etc)

Bonus points for:

Familiarity with industrial control platforms (e.g. Beckhoff or TwinCat)
Familiarity with Linux
Experience with industrial protocols (e.g. EtherCat, Profinet, Modbus, etc)
Familiarity with general networking (IP/UDP)

Must-have Requirements:

Ability to occasionally lift up to 50 lbs
Perform activities such as stooping, climbing, 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

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