{"id":131832,"url":"https://alion.io/job/commonwealth-fusion-systems-senior-algorithms-and-simulation-software-engineer","title":"Senior Algorithms and Simulation Software Engineer","company":{"id":8705,"name":"Commonwealth Fusion Systems","domain":"cfs.energy","url":"https://alion.io/company/commonwealth-fusion-systems","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":88,"open_postings":6,"ghost_share":0,"stale_share":0.5,"repost_share":0,"time_to_fill_p50_days":53,"computed_at":"2026-10-19T05:45:15Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Devens, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":140000,"max":200000,"currency":"USD","period":"year","gross":null,"usd_annual":200000},"salary_estimate":null,"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"CI/CD","optional":false},{"name":"Human-in-the-Loop","optional":false},{"name":"Python","optional":false},{"name":"Rust","optional":false},{"name":"Linux","optional":true}],"status":"live","first_seen_at":"2026-08-20T19:53:22Z","employer_posted_date":"2026-08-20","last_verified_at":"2026-10-19T17:24:31Z","board_verified":true,"closed_at":null,"days_open":59,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":59},"description":"Join the power movement as a Senior Algorithms and Simulation Software Engineer\nIn 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.\nAs 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.\nYou 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.\nWhat you'll do:\nDevelop mission-critical state estimation and control algorithms\nDevelop software infrastructure to operate Hardware-in-the-Loop (HITL) and software-only testbeds\nDevelop simulation models and model infrastructure for both real-time and offline (high fidelity) simulations\nDevelop offline data analysis tools\nHelp define and execute end-to-end and other integrated test cases and test plans to validate SPARC control software\nWhat we’re looking for:\nBachelor's degree in a relevant engineering field (computer science, computer engineering, electrical engineering, industrial engineering, etc.)\n7+ years relevant experience\nProfessional experience writing real-time state estimation and control algorithms\nExperience with modern software development lifecycle practices (CI/CD, git version control, unit testing, integration testing, etc)\nProficiency with Python\nProficiency with at least one real-time control language (C++, Rust, etc)\nBonus points for:\nExperience with Hardware-in-the-Loop testbeds and software-only testbeds for validating control software\nExperience writing models to validate software\nFamiliarity with Linux\nFamiliarity with general networking (IP/UDP)\nMust-have Requirements:\nPerform activities such as typing, standing, sitting, etc. for extended periods of time\nDedication 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\nWillingness to occasionally travel or work required 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