Principal BESS Engineer Energy Infrastructure Projects

is building the power infrastructure that makes the AI era possible. As AI demand surges past what the grid and traditional data centers can support provides a new class of power technology proven at gigawatt scale and trusted by the worlds leading cloud and AI companies. Our systems are already deployed across 2.5 GW of hyper-scale campuses validated by top U.S. national labs and certified for grid-safe operation by major utilities. With real products in the field were scaling faster than the grid can transforming power from a bottleneck into a competitive advantage for the companies building the future.

Principal Engineer BESS

Role Overview
Were looking for a Principal Engineer to set the technical direction for our BESS and DC Cabinet product lines and to own the product roadmap across multiple concurrent development cycles. This is the senior technical voice on the product team: youll architect new products resolve the hardest engineering trade-offs set the engineering standards others work to and represent product engineering externally to vendors customers certifying bodies and the broader industry. You should be comfortable operating with minimal direction holding the bar on technical quality and moving multiple product cycles forward in parallel without losing the thread on any of them.

What Youll Own

Architecture & Technical Direction

• Set the architecture for the BESS and DC Cabinet product lines and own the technical roadmap across multiple concurrent product cycles.
• Make the hard trade-off calls cost vs reliability performance vs lead time standardization vs customization and document the reasoning so future decisions inherit context.
• Define the engineering standards design rules and review gates that other engineers on the team work to. Own the product-engineering bar.
• Approve major design changes; act as the final technical authority on the change baseline.

Multi-Product Development

• Run multiple product development cycles in parallel concept through prototype FAT field deployment and revision without losing depth on any of them.
• Drive cycle cadence: decide what ships when where the technical risk lives what gets parallelized vs sequenced.
• Identify and execute the next-generation product moves higher voltage class alternate chemistries new form factors ahead of customer demand.

Detailed Engineering Depth

• Personally own the hardest pieces of work: novel architectures first-of-kind designs advanced component sizing (fuse coordination busbar thermal optimization protection coordination across cascaded systems) cabinet thermal modeling and complex protection schemes.
• Review and approve detailed engineering drawings SLDs GAs schematics panel layouts at the level required to sign off not just consult.

Vendor & Supply Chain Strategy

• Own the strategic relationships with key vendors DC Cabinet battery PCS BoP. Decide the architecture of those relationships: sole-source vs dual-source co-development depth IP boundaries.
• Set the technical qualification process used by the team and enforce it. Run the highest-stakes design reviews and resolve the highest-stakes vendor escalations personally.

Engineering Leadership & Mentorship

• Mentor and develop other engineers on the team. Build their technical judgment not just their throughput.
• Run design reviews. Lead post-mortems on field issues and turn them into product changes.
• Set the cadence and quality bar for ECR/ECN FMEA design reviews and product handoff.

External & Cross-Functional Representation

• Represent product engineering externally customer technical reviews vendor escalations industry working groups certifying bodies conferences.
• Partner with the commercial team on the most technically complex pursuits and proposals proposing architectures defending positions structuring technical exhibits in LTSAs and supply agreements.
• Brief leadership on technical risk and product roadmap decisions.

Required Qualifications

• Bachelors degree in Electrical Engineering Power Electronics or a closely related technical field. MS preferred.
• 10 years of hands-on engineering experience in BESS power electronics UPS or comparable mission-critical industrial power systems with a demonstrated record of operating with minimal direction in a senior technical role.
• Owned multiple product development cycles end-to-end and independently. Youve personally taken more than one product from concept through prototype FAT field deployment and revision and the products are still in the field.
• Architecture-level decision authority on previous BESS or DC equipment. Youve made the trade-off calls others built around not just executed someone elses architecture.
• Deep demonstrable skill in detailed component sizing fuse coordination busbar sizing protection device selection thermal sizing for enclosed cabinets at the level required to sign off on production designs.
• Fluency producing and reviewing SLDs GAs schematics and panel layouts; expert with AutoCAD or equivalent E-CAD; comfortable across mechanical drawings.
• Strong track record running strategic vendor relationships through design FAT serial production and post-deployment escalation.
• Excellent written and verbal communication specs technical positions design review leadership board-level briefings.
• Willing to travel up to 2530% for FAT inspections site commissioning customer engagements and vendor reviews.

Preferred

• Direct experience with data center / UPS / mission-critical power or utility-scale BESS at the architecture level.
• Active involvement in standards bodies (UL IEC NFPA IEEE working groups CSA TC committees) or technical conference contributions.
• Patents peer-reviewed publications or other evidence of recognized technical depth in the field.
• PE license.
• Familiarity with UL 9540 / 9540A NFPA 855 IEC 62619 IEEE 1547 NEC Article 706 plus the relevant codes for target markets.
• Experience standing up or scaling structured PLM ECR/ECN and design-review processes.
• Multi-domain depth BMS / cell engineering PCS / power electronics thermal / mechanical alongside the EE core.

For US-based roles - What youll get:

• Competitive salary annual performance-based bonus eligibility
• Medical dental and vision insurance
• 401(k) with company match
• Paid time off and company holidays

For Mexico-based roles - What youll get:

• Competitive salary annual performance bonus eligibility
• Christmas Bonus (Aguinaldo): 30 days
• Major medical expenses and life insurance
• Paid time off and holidays (per local policy)

For all roles:

• Professional development and growth opportunities
• Opportunity to grow with a mission-driven team shaping the future of clean energy
• Equal Opportunity: is committed to equal employment opportunity and to maintaining a work environment free of harassment discrimination or retaliation.
• Accommodations: If you need an accommodation during the application process email
• Benefits vary by role and location and are subject to change.