Mainspring Energy
Senior Reaction Controls Engineer
- Compensation
- $134K–$159K / yr
- Location
- Menlo Park, CA, US
- Arrangement
- Hybrid
- Employment type
- Other
- Level
- Senior
- Posted
- 17 September 2026 (13 days ago)
Checked 13 days agoApplications go to the employer, never to RoleSprint
About this role
Job Overview Do you love thermodynamics and dynamic system control? Have you thought about thermodynamic cycles as both continuous and discrete dynamic systems? As other industries convert their thermodynamic machines to electromagnetic machines and electrify their platforms, would you like to help generate that clean electricity?
Linear generators are a new platform that take advantage of mechanically unconstrained piston motion to cleanly and efficiently oxidize a variety of environmentally friendly fuels with disparate properties (like biogas, hydrogen, and ammonia). The linear generator reaction is close to an ideal Otto cycle, so knowledge and intuition of engine control, thermodynamics, and reaction kinetics are applicable here.
Mainspring has a high-impact opportunity for a Senior Controls Engineer on our reaction control team to help optimize the system performance by incorporating physics-based models with modern control algorithms to improve reliability, prolong service intervals, and increase power and efficiency.
Responsibilities • Implement models, algorithms, and continuous-integration (MIL, SIL, PIL) tests in C++
• Develop novel fuel, air, compression ratio, and cooling automation and control strategies to improve performance, reliability, and expand the capabilities of the generator to address customer needs
• Design, execute, and analyze experiments using Python on virtual or real generators to realize the impact of your work on real generators
• Collaborate with other controls engineers on designs and architectures
• Debug sensors, actuators, and subsystems for noise and disturbances and assist in calibration, verification, and validation. Communicate algorithms with block-diagrams, pseudo-code, code, etc.
• Analyze complex thermodynamic-mechatronic systems with experimental data and create representative plant models
• Support reliability and manufacturing testing of systems under control
• Analyze data to assess performance capabilities and inform requirements and design decisions
• Support fleet generator operation to enhance reliability and performance
Qualifications • Driven and self-directed enthusiastic contributor
• Excellent communicator with demonstrated collaboration across multidisciplinary teams
• Multiple years of experience designing, implementing, and testing algorithms in thermodynamic machines - experience with engines is a plus
• BS + 5 years relevant experience, MS + 3 years, or Ph.D. in mechanical engineering or related degree
Work location
- Menlo Park, CA, US
Related jobs
Ready to make a decision?
This role is either worth your time or it isn’t.
Analyze the posting against your experience, see the gaps clearly, and build the right materials only if the opportunity makes sense.
Nothing is submitted automatically. You choose what happens next.
About this listing
Advertised by Mainspringenergy and published on Lever, the applicant tracking system they use.
RoleSprint is not the employer and not a recruiter. Applications are made on the employer’s own site and never reach us; what RoleSprint does is help you decide whether a role is worth your time and prepare for it if it is.
Published 17 September 2026, last checked 13 days ago. A posting stops being advertised here 90 days after the employer published it, and one the employer takes down is marked closed rather than quietly removed.