Senior Sales Engineer

Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that provide reliable, affordable, and sustainable electric power. The Senior Sales Engineer serves as a senior technical contributor in the sales cycle, developing system architectures, designs, estimates, and proposal packages while supporting customers and coordinating technical execution across internal teams.

Responsibilities

• Develop system architecture, preliminary designs, and cost estimates from concept through execution handoff
• Articulate and support sound technical approaches, ensuring appropriate design integration and tradeoff evaluation
• Produce complete, accurate, and timely proposal packages across multiple concurrent projects
• Build well-supported cost estimates, proactively communicate risks, and incorporate market inputs into pricing assumptions
• Support customer meetings, site walks, and solution presentations as the technical subject matter expert
• Communicate technical concepts in clear, structured, and solution-oriented formats across customer and internal stakeholders
• Collaborate with Engineering, Product, Controls, Commissioning, and Project Management to support technical feasibility and execution alignment
• Contribute to peer design reviews to share technical perspective and strengthen overall solution quality

Preferred

• Experience in distributed energy, solar, batteries, fuel cells, microgrids, or related technologies preferred
• Distributed Energy
• Solar Energy
• Battery Technology
• Fuel Cell Technology
• Microgrids

Benefits

• This position is remote
• Eligible for a 10% annual bonus
• Pre-IPO company equity through Restricted Stock Units (RSUs)

Company

• Manufacturer of local power generators for utilities, data centers, enterprise
• Menlo Park, California, USA
• https://mainspringenergy.com/
• Founded in 2010
• 201-500 employees

Qualifications

• Bachelor's degree in Electrical/ Mechanical/ Systems/ Energy Engineering
• 7+ years of experience in sales engineering, applications engineering, front-end engineering development (FEED) or cost estimating within electrical power systems or related industries
• Familiarity with electrical power systems, three phase inverters, protection relays, and the physics of grid integration
• Strong understanding of standard electrical drawings such as wiring diagrams, electrical schematics, and one-lines
• Ownership Mentality: Proactive in identifying risks and comfortable advocating for the resources needed to solve them
• Experience in distributed energy, solar, batteries, fuel cells, microgrids, or related technologies preferred

Required skills

• Sales Engineering, Applications Engineering, Front-End Engineering Design (FEED), Cost Estimating, Electrical Power Systems, Three-Phase Inverters, Protection Relays, Grid Integration, Wiring Diagrams, Electrical Schematics, One-Line Diagrams, Distributed Energy

Experience

• 7+ years