Senior Power Electronics Engineer Torrance, CA; Rio Rancho, NM Long Range Strike Systems

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.

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

Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.

This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the…