Electrical Engineer - Balance of System Integration Engineer

Job Overview

Mainspring is seeking a versatile Systems Integration Engineer to lead the architectural design and deployment of the hardware‑to‑software interface for our Linear Generator sites, serving as a cross‑functional technical lead for Balance of System (BoS) strategy and modular hardware platform development.

• Manage the full design cycle for NEMA 3R and 4X control cabinets, including component selection for industrial PCs, managed switches, and I/O modules.
• Design and implement I/O mapping for control and safety systems, including E‑Stop synchronization, black start triggers, and ground‑fault detection using Modbus/TCP‑based edge devices.
• Architect robust site‑level communication networks with managed VLAN structures and fiber/copper hybrid topologies for high‑demand environments.
• Serve as the primary technical interface for outsourced design firms and panel manufacturers, ensuring high‑reliability designs, UL‑508A compliance, and manufacturing scalability.
• Lead technical reviews and coordinate with contract manufacturers to drive cost‑reduction, design‑for‑manufacturability (DFM), and UL‑508A certification.
• Manage the physical and electrical interfaces between the linear generator and external balance‑of‑system equipment, such as external grid‑tied inverters.

• Bachelor's or Master's degree in Electrical Engineering or a related field.
• 8+ years of demonstrated experience developing industrial control panels and integrated systems.
• Strong understanding of DC/AC power distribution, relay logic, and industrial communication protocols (Modbus, Ethernet/IP).
• Proven experience integrating complex hardware platforms with third‑party software controllers or utility‑level aggregators.
• Experience with UL‑508A standards, control panel layout, and thermal management in outdoor environments (−30 °C to 50 °C).
• Ability to manage complex project dependencies, including hardware fitment within tight spatial constraints.

• Familiarity with grid‑tied inverters, battery pre‑charge circuits, or Linux‑based industrial PCs.
• Experience with PLC programming, microgrid or SCADA system integration.

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 and benefits.

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.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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.