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Senior Realtime Controls Software Engineer

Join Commonwealth Fusion Systems in Devens, United States, as a Senior Realtime Controls Software Engineer. Develop real-time control algorithms, hardware communications and simulation tools for the SPARC project, using C++ and Python. Work across software and hardware testbeds to validate mission-critical systems. The role offers equity, flexible holiday and professional growth opportunities.

Salary
US$107,000–160,000/yr
Location
Devens, MA
Workplace
Hybrid
Job type
Full time
Applies on jobs.lever.co

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Job description

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 real-time control algorithms, hardware communication, plus models and simulation frameworks necessary to verify those algorithms. Your algorithms will be used in critical, hard real-time applications in the SPARC project, as well as related projects. Your algorithms will generally be implemented in C++ and run as a Linux application.

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 control algorithms
  • Develop software to communicate with hardware sensors/actuators
  • 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 off-line (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
  • Experience writing models to validate software
  • Familiarity with Linux
  • 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

$107,000 - $160,000 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

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.

Pay & benefits

US$107,000–160,000 /yr
Health insurance Dental insurance Vision insurance Retirement plan Equity Paid time off Parental leave

About this role

Posted
11 Nov 2026
Sectors
Timezone
UTC-05:00
Experience
7+ years of relevant experience

About Commonwealth Fusion Systems

Company Overview

Commonwealth Fusion Systems (CFS)

Cambridge, MA, United States

2018

Approximately 430 employees (source: zoominfo.com). Revenue figures vary, with reports indicating $211.3 million or $31.7 million, though as a pre-revenue fusion developer focused on R&D, these may reflect funding or operations rather than sales.

What They Do

Commonwealth Fusion Systems (CFS) is a pioneering private fusion energy company that specializes in tokamak-based magnetic confinement fusion. Founded as a spinout from MIT's Plasma Science and Fusion Center, CFS focuses on utilizing high-temperature superconducting magnets to achieve commercial net energy production (source: cfs.energy). The company has made significant strides in its technology, particularly with the development of compact fusion machines that leverage decades of tokamak science. Their flagship projects, SPARC and ARC, aim to demonstrate net energy gain and commercial viability in the coming years (source: cfs.energy).

Projects & Track Record

CFS is currently engaged in several groundbreaking projects, most notably the construction of SPARC, which is set to be the world's first net-energy fusion machine. Located at their Fusion Energy Campus in Devens, Massachusetts, SPARC aims to demonstrate net energy gain by the late 2020s (source: cfs.energy). Additionally, CFS is planning the ARC project, a 400 MW-class grid-scale tokamak power plant designed for commercial deployment in the early 2030s. These projects are underpinned by significant technological advancements, including the successful testing of the central solenoid magnet module (CSMC) in November 2024, which confirmed the manufacturability of critical components for SPARC (source: zoominfo.com).

Recent Developments

In the past two years, CFS has made remarkable progress, including the opening of its Devens Fusion Energy Campus on February 10, 2023, which was attended by notable figures such as U.S. Secretary of Energy Jennifer Granholm (source: cfs.energy). The company has also secured substantial funding, raising $863 million in August 2024, building on a previous $1.8 billion round in May 2023, bringing total funding to over $2 billion (source: wbjournal.com). Furthermore, CFS announced its first commercial power plant site in Chesterfield County, Virginia, which will be independently financed and operated, with plans for grid connection in the early 2030s (source: zoominfo.com).

Working There

CFS offers a range of roles across various disciplines, including fusion science, engineering, manufacturing, and materials science. The majority of their workforce is based at the Devens campus, which has grown to over 430 employees (source: cfs.energy). The company culture emphasizes rapid execution and transparency, attracting top talent from the fusion and manufacturing sectors. Key executives include Co-Founder and CEO Bob Mumgaard, along with other leaders in operations and science, indicating a strong demand for expertise in tough tech and physics (source: nasdaqprivatemarket.com). While specific benefits are not detailed, the scale-up and investor backing suggest competitive packages for high-caliber roles in a mission-driven environment (source: cfs.energy). Job seekers are encouraged to monitor their careers page for openings related to SPARC and ARC advancements.

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Senior Realtime Controls Software Engineer
Commonwealth Fusion Systems · US$107,000–160,000/yr