Engine Test & Development Engineer

Exowatt is revolutionizing the energy landscape for the AI era with our groundbreaking P3 system that captures solar energy, stores it as heat, and generates electricity on demand. Founded in 2023 and backed by leading investors including Andreessen Horowitz, Sam Altman, and Felicis, we're committed to providing clean, modular, and scalable power that meets the rapidly growing demands of AI infrastructure.

Our mission is to make sustainable renewable energy always available and almost free, enabling technological advancement while protecting our planet.

We are seeking an exceptional Engine Test & Development Engineer with deep expertise in testing reciprocating engines, to lead the development and optimization of our heat engine systems. This is a hands‑on role and will involve testing, design, analysis, assembly and disassembly of Stirling engines. This role is critical to our mission of delivering reliable, cost‑effective renewable energy  will be at the forefront of modernizing the next generation of Stirling engine technology for modern energy applications, working directly with our thermal storage systems to convert stored heat into dispatchable electricity.

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

• Design, develop and optimization power conversion unit system, with primary focus on Stirling engine configurations
• Participate in test cell and test engine performance improvements in terms of engine efficiency, reliability, and power density for 24/7 operation
• Integrate heat engines with our proprietary thermal storage systems and power generation infrastructure
• Establish and validate thermodynamic models for engine performance across varying temperature differentials and operating conditions
• System Design & Development
• Design and optimize critical engine components including pistons, cylinders, regenerators, heat exchangers, and linear alternator systems
• Develop innovative solutions for hermetic sealing, working fluid management, and pressure vessel design
• Participate in material selection for high‑temperature applications, focusing on durability over 30‑year operational lifespans
• Assist in the development of modular engine architectures to enable rapid deployment & scalability.
• Manufacturing & Production
• Collaborate with manufacturing teams to transition designs from prototype to mass production
• Establish quality control standards and testing protocols for engine components and assemblies
• Drive design for manufacturability (DFM) initiatives to reduce costs while maintaining performance
• Support domestic supply chain development for critical engine components
• Testing & Validation
• Develop comprehensive test plans for engine performance, durability, reliability and validation testing
• Lead root cause analysis and failure mode investigations
• Establish predictive maintenance protocols and condition monitoring systems
• Oversee field testing and commissioning of engine systems at customer sites

• Education & Experience
• Bachelor's degree in Mechanical Engineering or related field;
  Master's or PhD preferred
• Experience designing, testing, sensors, data acquisition system and engine test cell development.
• Demonstrated expertise in leveraging engine system simulations (1D simulations) for engine hardware development.
• Track record of bringing engine systems from concept through production
• Technical Expertise
• Deep understanding of thermodynamic cycles, particularly Stirling, Otto, and Rankine cycles
• Expertise in data acquisition systems, engine test cell development and operation, engine controls, experimental data analysis.
• Proficiency in one or more of engine modeling and simulation tools: SAGE, GT-Power, SIMSCAPE, SIMULINK, ANSYS, or similar.
• Experience with high‑temperature materials and thermal management systems, and heat exchanger design.
• Knowledge of power generation systems and grid integration
• Skills & Competencies
• Strong analytical and problem‑solving abilities with focus on first‑principles thinking
• Experience with Design of Experiments (DOE) and statistical analysis methods
• Proficiency in CAD…