Senior Sales Engineer

Develop plant-level system architecture, preliminary designs (site layouts, single-line diagrams, medium-voltage collector and step-up transformer configuration, and point of interconnection scope), and cost estimates from concept through execution handoff.

Articulate and support sound technical approaches, ensuring appropriate design integration and tradeoff evaluation (e.g., MV voltage selection, unit block sizing, redundancy and availability, grid-forming vs. grid-following operation).

For large-load and data center sites, define at the proposal stage how the plant serves and protects the load, including islanding, load-following, black start, and transfer schemes.

Define plant controls, communications, and protection scope (PPC, SCADA/EMS, utility telemetry, protective relaying, revenue metering) and the grid code (IEEE 1547/2800), ISO/RTO, and NERC requirements that drive equipment selection and cost.

Produce complete, accurate, and timely proposal packages, including responses to utility, IPP, and data center developer RFPs, across multiple concurrent projects.

Build well-supported cost estimates covering MV balance of plant, civil/structural, gas fuel systems, and interconnection facilities, proactively communicate risks, and incorporate market inputs into pricing assumptions.

Develop EPC scopes of work and responsibility matrices that clearly split scope between Mainspring, the customer, EPC partners, and the utility, and that carry cleanly into contracts and project execution.

Identify technical and commercial risk in customer specifications and contract terms (performance guarantees, availability, grid code compliance, interconnection cost exposure) and drive resolution before award.

Support customer meetings, site walks, and solution presentations as the technical subject matter expert with utilities, IPPs, data center developers, and EPC partners.

Communicate technical concepts in clear, structured, and solution-oriented formats across customer and internal stakeholders.

Support the interconnection team on early-stage applications by supplying plant data, single-lines, and equipment models; interpret Feasibility, System Impact, and Facility Study results and reflect network upgrade and interconnection facility costs in pricing.

Evaluate site constraints that affect plant feasibility and cost, including gas fuel supply (pressure, flow, delivery infrastructure), power density and layout, hazardous area requirements, and air permitting.

Collaborate with Engineering, Product, Controls, Commissioning, Interconnection, Supply Chain, and Project Management to support technical feasibility and execution alignment.

Contribute to peer design reviews to share technical perspective and strengthen overall solution quality.

Feed lessons learned from grid-scale pursuits back into reference designs, estimating tools, and proposal templates.

Bachelor's degree in Electrical/ Mechanical/ Systems/ Energy Engineering (power systems emphasis preferred)

7+ years of experience in sales engineering, applications engineering, front-end engineering development (FEED) or cost estimating within electrical power systems or related industries, including at least 2 years supporting grid-scale (10 MW+) generation or storage projects, either grid-connected or serving large loads such as data centers

Experience in solar, batteries, fuel cells, microgrids, reciprocating engines/gensets, modular generation packages, or related technologies preferred

Familiarity with electrical power systems, three phase inverters, protection relays, and the physics of grid integration.

Working knowledge of medium-voltage (5 kV+) plant electrical systems, including collector systems, step-up transformers, gen-ties, switchgear, and the plant-side interface to the utility substation or point of interconnection.

Familiarity with utility interconnection processes (Feasibility, System Impact, and Facility Studies) and applicable standards and grid codes (NEC, NESC, IEEE 1547/2800, ISO/RTO requirements, NERC reliability standards).

Experience estimating balance of plant and EPC scope for multi-MW facilities, including MV equipment, civil/structural, and fuel systems.

Strong understanding of standard electrical drawings such as wiring diagrams, electrical schematics, one-lines, P&IDs, and civil site plans.

Ownership Mentality: Proactive in identifying risks and comfortable advocating for the resources needed to solve them.

Ability to travel nationally (~25%)

Power systems study experience or familiarity with tools such as PSS/E, PSCAD, ETAP, SKM, or CYME (load flow, short circuit, arc flash).

Plant-level controls experience: power plant controllers, SCADA/EMS, DERMS, including microgrid black start, islanding, and load-following.

Familiarity with large-scale gas fuel systems (natural gas, biogas, or hydrogen) and hazardous area classification (NFPA, Class I Div 1/2).

Prior experience with an EPC contractor, utility, or IPP on large generation projects.