Senior Power Electronics Engineer

Senior Power Electronics Engineer

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not just concepts.

This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact.

We are seeking a Senior Power Electronics Engineer to develop and integrate advanced electrical power systems for Castelion's long-range hypersonic strike vehicles. This role is critical to ensuring reliable power generation, storage, and distribution across mission-critical avionics and vehicle subsystems. You will work hands-on with multidisciplinary engineering teams to design, analyze, test, and validate power electronics hardware in a fast-paced, hardware-driven environment.

• Design and develop power electronics systems including battery architectures, power conversion, and distribution for high-performance flight vehicles
• Lead the design and optimization of power controllers and power management systems to ensure stable, efficient operation across all mission phases
• Develop and analyze battery systems, including selection, packaging, thermal considerations, and safety mechanisms for demanding environments
• Work closely with avionics, GNC, and flight software teams to ensure seamless integration of power systems with vehicle subsystems
• Conduct circuit-level and system-level modeling and simulation to evaluate performance, efficiency, and reliability under dynamic conditions
• Support hardware bring-up, integration, and test campaigns, including troubleshooting and root cause analysis
• Define and execute qualification and flight test plans, translating results into system-level improvements
• Mentor junior engineers and contribute to best practices in power electronics design
• Partner closely with program leadership to make technical trades aligned with mission success

• Bachelor's, Master's, or PhD in Electrical Engineering or related field
• 5+ years of experience in power electronics design, analysis, and validation for aerospace, defense, or other high-reliability systems
• Strong background in battery systems, power conversion (DC-DC), and power distribution architectures
• Experience designing power controllers and power management systems for embedded or avionics applications
• Proficiency in circuit design, simulation, and analysis tools (e.g., SPICE, MATLAB/Simulink, or equivalent)
• Experience with hardware bring-up, test, and troubleshooting in a lab or flight hardware environment
• Familiarity with thermal management, EMI/EMC considerations, and ruggedized electronics design
• Strong problem-solving mindset, thriving in a fast-paced, hardware-rich, high flight cadence environment

While this position does not currently require a U.S government-issued security clearance, it may in the near future. Therefore, the ability to obtain and maintain a U.S. government–issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.