Lead Thermal Engineer - Battery

Exowatt is a next generation renewable energy company offering commercial and industrial customers a modular full-stack energy solution that can provide dispatchable power and heat for up to 24 hours per day, specifically designed to meet the needs of energy-intensive applications such as data centers. Our mission is clear, to make sustainable renewable energy always available and almost free. Exowatt is based in Miami, Florida and backed by notable investors such as a16z, Atomic, Sam Altman, and Felicis.

We are seeking an exceptional Thermal Engineering Lead - Battery to drive the thermal management strategy for our groundbreaking thermal battery systems. This senior technical role focuses on developing and optimizing cutting-edge thermal solutions that maximize energy storage efficiency while ensuring optimal performance across diverse operating environments.

This position is based in Miami, FL. If selected, relocation to Miami, FL is required. Exowatt provides relocation assistance.

• Advanced Thermal System Development
• Design, analyze, and optimize sophisticated thermal management systems for Exowatt's thermal battery products
• Develop thermal architecture solutions for next-generation energy storage systems, balancing performance, efficiency, and manufacturability
• Create thermal design standards and technical specifications for product development
• Pioneer innovative approaches to thermal energy storage and heat transfer optimization

• Engineering Analysis & Simulation
• Perform complex thermal analysis using advanced simulation tools and experimental validation methods
• Conduct thermal performance modeling and prediction for large-scale battery storage systems
• Execute finite element analysis (FEA) and computational thermal design for critical components
• Develop and validate sophisticated thermal models that inform design decisions

• Technical Integration & Collaboration
• Work with mechanical, electrical, and systems engineering teams to integrate optimal thermal solutions
• Collaborate with manufacturing and quality teams to ensure thermal designs are production-ready
• Partner with product teams to translate thermal requirements into market-leading products
• Participate in technical reviews and provide thermal expertise for design decisions

• Testing & Validation
• Develop and implement comprehensive thermal testing strategies, including thermal cycling, environmental testing, and accelerated life testing
• Design and execute prototype testing programs that validate thermal performance under real-world conditions
• Conduct failure analysis investigations and implement systematic corrective actions
• Establish thermal qualification procedures for new product introductions

• Technical Excellence & Documentation
• Create detailed technical documentation including design specifications, testing protocols, and analysis reports
• Develop technical presentations for internal teams, customers, and industry conferences
• Build relationships with thermal technology vendors and research institutions
• Contribute to Exowatt's thermal engineering knowledge base and best practices

• Product Development Support
• Support full product development lifecycle from early concept through commercial production
• Ensure thermal requirements and performance targets are achieved throughout development
• Drive continuous improvement initiatives to maximize energy storage efficiency and system reliability
• Provide thermal expertise for manufacturing optimization and cost reduction

• Education & Experience
• BS/MS/PhD in Mechanical Engineering, Thermal Engineering, or related field
• 7 years of progressive thermal engineering experience in energy systems or related industries
• Proven track record developing thermal solutions for complex engineering systems
• Experience with energy storage, battery systems, or high-temperature thermal management

• Technical Expertise
• Expert-level understanding of heat transfer fundamentals in complex energy systems
• Advanced proficiency with mechanical CAD software (SolidWorks, CATIA, or similar)
• Extensive experience with thermal analysis software (ANSYS Fluent, COMSOL, or equivalent)
• Deep expertise in finite element analysis (FEA) and computational thermal design
• Demonstrated experience designing high-efficiency heat exchangers for demanding applications

• Specialized Experience
• Experience with thermal management of large-scale energy storage systems
• Background in thermal analysis of systems operating in challenging environments (high temperature, outdoor, industrial)
• Knowledge of thermal interface materials, phase change materials, and advanced heat transfer technologies
• Experience with thermal testing equipment and measurement systems
• Understanding of thermal safety considerations in energy storage applications

• Technical Skills & Abilities
• Excellent analytical and problem-solving skills with systematic approach to root cause analysis
• Strong technical communication skills with ability to present complex thermal concepts
• Ability to work independently while collaborating effectively across disciplines
• Experience with thermal materials and components selection and specification
• Capability to make data-driven engineering decisions under tight timelines

• Industry Knowledge
• Experience with renewable energy systems, battery technology, or thermal energy storage
• Knowledge of relevant industry standards and regulations (UL, IEC, etc.)
• Understanding of manufacturing processes for thermal systems
• Familiarity with thermal materials and components supply chains
• Awareness of current trends in thermal energy storage technology

• PhD in Thermal/Mechanical Engineering with focus on energy storage or heat transfer
• 10 years of thermal engineering experience in energy, automotive, or aerospace industries
• Experience with molten salt systems, concentrated solar power, or thermal energy storage
• Background in startup or high-growth technology companies
• Published research in thermal engineering or energy storage
• Professional engineering license (PE)
• Experience with thermal simulation of grid-scale energy systems

What We Offer:

Competitive salary and equity options.

Comprehensive benefits package, including health, dental, and retirement plans.

A dynamic work environment that fosters creativity and innovation.

Opportunities for professional growth and development in a rapidly evolving industry.

Relocation assistance.

Salary : $180,000 - $215,000