Junior Electronics Engineer Jobs in California (NOW HIRING)

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 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.

• 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

• 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

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.

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.

All full-time employees are granted meaningful long-term equity, sharing in the company's significant growth trajectory. We offer four (4) weeks of paid time off, ten (10) company-paid holidays, and comprehensive health benefits - including 100% employee-covered medical and strong dependent coverage, along with dental and vision plans. We also provide paid parental leave to support growing families, a $100 monthly fitness stipend to promote health and performance, and onsite EV charging for convenience. In addition, employees enjoy perks like catered meals, company-covered food during high-demand periods, and a fully stocked kitchen to stay fueled throughout the day.

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.