Senior Power Electronics Engineer

Why Castelion, Why Now 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. Senior Control Electronics Engineer We are seeking a Senior Control Electronics Engineer to design and deliver real-time electronic control systems for Castelion's long-range hypersonic strike vehicles. This role is critical to enabling precise actuation and vehicle control through robust, high-performance electronics. You will work hands-on with multidisciplinary engineering teams to design, build, test, and validate control electronics hardware, with a focus on thrust vector control (TVC) systems and attitude control system (ACS) drivers in a fast-paced, hardware-driven environment. Responsibilities • Design and develop real-time control electronics for flight-critical systems, including TVC controllers and attitude control system (ACS) driver electronics • Lead the architecture and implementation of actuator control systems, including motor drivers, valve drivers, and associated feedback/control loops • Develop high-reliability analog and mixed-signal circuits for precision control, sensing, and actuation • Work closely with GNC, avionics, and flight software teams to ensure seamless integration of control electronics with vehicle systems • Perform circuit-level and system-level modeling and analysis to validate performance, stability, and robustness under dynamic flight conditions • Support hardware bring-up, integration, and test campaigns, including debugging, root cause analysis, and performance tuning • Define and execute qualification and flight test plans, translating results into system-level improvements • Ensure designs meet requirements for thermal performance, EMI/EMC, and operation in extreme environments • Mentor junior engineers and contribute to best practices in control electronics design • Partner closely with program leadership to make technical trades aligned with mission success Basic Qualifications • Bachelor's, Master's, or PhD in Electrical Engineering or related field • 5+ years of experience designing and validating control electronics for aerospace, defense, or other high-reliability systems • Strong background in real-time control systems, actuator electronics, and feedback control implementation in hardware • Experience designing motor drivers, valve drivers, or similar high-performance actuator control electronics • Proficiency in analog and mixed-signal circuit design, simulation, and analysis (e.g., SPICE, MATLAB/Simulink, or equivalent) • Experience with hardware bring-up, integration, and troubleshooting in a lab or flight hardware environment • Familiarity with EMI/EMC design practices, ruggedized electronics, and operation in high-vibration/high-temperature environments • 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. Other Duties 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. Additional Eligibility Requirements 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 required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply. Affirmative Action/EEO Statement Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law. Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact hr@castelion.com. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law. Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation. EAR/ITAR Requirements This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.