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About the Role

As a Staff Mechanical Engineer — Thermals, you will drive thermal architecture, cooling strategy, and safety design for utility-scale Battery Energy Storage Systems (BESS), spanning outdoor cabinets and containerized platforms. You will design Chiller-based, liquid-cooled, air-cooled, and hybrid thermal systems that support multi-MWh energy storage installations operating in demanding outdoor environments.

Responsibilities

Drive thermal architecture, cooling strategy, and safety design for cabinet-level and containerized BESS platforms from concept through production.
Design Chiller-based, liquid-cooled, air-cooled, and hybrid thermal systems including heat exchangers, chillers, cooling plates, pumps, valves, manifolds, fans, and ducting.
Apply first-principles thermal engineering to design efficient, reliable, and cost-effective cooling solutions.
Perform system-level and detailed thermal and CFD analysis to inform production-ready designs.
Lead arcing analysis, containment design with sensors, venting, pressure-relief mechanisms, and propagation-mitigation strategies.
Drive DFMEA, root-cause analysis, and corrective actions based on test data and field feedback.
Support supplier selection and technical design reviews while balancing performance, reliability, manufacturability, and cost.
Support certification efforts and AHJ interactions across global safety and compliance standards.
Provide technical guidance and mentor junior engineers.

Requirements

Bachelor's or Master's degree in Mechanical or Thermal Engineering.
8+ years of hands-on experience, including utility-scale BESS thermal architectures.
Proficiency in thermal and CFD simulations including system-level and detailed analysis.
Experience translating simulation results into production-ready designs supporting NFPA 68 and NFPA 69.
Experience with arcing analysis, containment design, venting, pressure-relief, and propagation-mitigation.
System-level understanding of PCS architectures, battery rooms, and thermal coordination with BMS, EMS, and PCS derating logic.
Capability designing for high-ambient, high-altitude, corrosive environments, and long-duration energy storage systems.
Experience with reliability-driven thermal design for 15–25-year system life targets.
Working knowledge of global safety and compliance standards including UL 9540/9540A, NFPA 855/68/69, and IEC standards.
Technical leadership skills with the ability to lead projects and influence design decisions.

Skills

Thermal engineering
CFD analysis
Icepak
Fluent
COMSOL
FLACS
DFMEA
Root-cause analysis
Technical leadership
Mentorship

Location

Austin, Texas

Work Type

On-site
Full-time

Experience Level

8+ years

Education Level

Bachelor's degree
Master's degree

Salary/Compensations

$100,000 - $151,000

Benefits

Bonus
Equity
Benefits

About the Company

Global energy technology company and a leading provider of solar, battery, and electric vehicle charging products.
Founded in 2006 with innovative microinverter technology.
More than 80 million products shipped across 160 countries.