Mainspring Energy

Sustaining Controls Engineer

Mainspring Energy · Menlo Park, CA
Menlo Park, CA $119K–$140K Posted 2026-10-01
Salary
$119K–$140K
Type
Full-time
Experience
2+ yr

About Mainspring
Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more.
The core values that ground our work, guide our decisions, and connect us together:
Pragmatic Optimism
Excellence without Ego
Proactive Collaboration

Does your experience not meet all of our posted requirements? Studies have shown that some people are less likely to apply to positions unless they meet every listed requirement. At Mainspring, we are committed to building a diverse, inclusive, flexible, and collaborative environment, so if you want to help us transition the world to clean and affordable electricity, and don’t meet all posted requirements for a particular role, we’d still love to hear from you. Mainspring can sometimes be flexible enough to shift responsibilities for the right person, or otherwise identify open or upcoming roles that may better fit your professional background.
In more traditional words, Mainspring Energy, Inc is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.
This compensation and benefits information is based on Mainspring Energy's estimate as of the date of publication and may be modified in the future. We generally do not negotiate on salary once we have made an offer. The level of pay within the range will depend on a variety of job-related factors that may include location, relevant prior experience and/or education, or particular skills and expertise. New hires joining the company tend to be paid within the starting base pay range noted above, with opportunities to increase pay over time based on development of additional skills, competencies, and company-specific knowledge.

The Sustaining Controls Engineer will play a crucial role in the success of our product automatically and reliably fulfilling customers’ electricity demand. You will work closely with cross-functional teams to diagnose and resolve issues, differentiate between mechanical, electrical, and software-related problems, and document solutions to increase product reliability and reduce maintenance needs. This position is ideal for a multidisciplinary engineer who enjoys working on complex systems and has a keen eye for detail.
•

Manage, document, and resolve fleet issues ensuring clear communication and follow-up on resolutions and improving the process

•

Diagnose root causes of system issues, distinguishing between mechanical, electrical, and software-related problems

•

Categorize, systematize, and address gaps in automated system behavior

•

Collaborate with cross-functional teams to provide technical support and enhance system behavior

•

Debug and troubleshoot existing control algorithms to improve system performance and reliability

•

Analyze and understand C++ code to interpret behavior

•

Implement fixes to field issues in C++ code, and test them in simulation and laboratory environments

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Adjust feature designs to address field issues

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Use Python for data analysis, scripting, and system diagnostics

•

Tune control gains and calibrate systems, documenting the process for future reference

•

Identify and address gaps in system performance, ensuring continuous improvement

•

Support reliability and manufacturing testing, contributing to the system's life cycle maintenance
•

Experience in successful root cause analysis of complex software-mechatronic systems

•

Driven and self-directed systems-thinker responsible for creating or improving effective sustaining engineering processes

•

Excellent communicator with demonstrated collaboration across multidisciplinary teams

•

Degree in mechanical or electrical engineering with controls focus

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2-5 years of experience
This position is onsite at our Menlo Park HQ. The salary will be adjusted to reflect local market conditions based on employee location as well as the experience of the employee. Along with the base salary, Mainspring offers pre-IPO stock options + benefits

PythonC++
$110K — 10th pctl $265K — 90th pctl
This role’s midpoint $129K vs. market median $180K for Engineering roles
-30%
below median
Based on 24,000+ Engineering roles with disclosed salary ranges tracked on NewJob.
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