Senior Power Electronics Engineer

Job Description
Castelion was founded to restore America's ability to field advanced weapons at speed and scale. Inspired by the engineering urgency of the WWII and Apollo eras, we combine rapid iteration, vertical integration, and scalable manufacturing to deliver affordable, high-performance strike systems. Our mission: rebuild industrial agility to strengthen national security and outpace evolving threats.

About the Role:


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.

Requirements

• 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

Benefits

• Employee Equity: Meaningful equity forall full-time employees - share value has increased 150x in three years
• Personal Time Off: Four (4) weeks of paidtime off to unplug, reset, and come back sharp-velocity matters,burnout doesn't
• Company Paid Holidays: Ten (10) companypaid holidays
• Medical: We offer plans at 100% employeecovered and 80% of dependent coverage
• Dental & Vision: We cover 90%employees and 80% for dependents to ensure you and your family haveaccess to quality preventive and ongoing care
• FSA/HSA: To support long-term health andfinancial resilience, we offer FSA and HSA options that allowemployees to set aside pre-tax dollars for eligible medical anddependent care expenses
• Retirement: 401k plan offered to supportlong term financial growth along side high-impact, high-velocity work
• Paid Parental Leave: We support growingfamilies with meaningful time to bond and recover. Birthing parentsare eligible for up to 10 weeks of paid leave, while non-birthingparents may take up to 4 weeks of paid leave. This time can be usedfor pre-natal care, pregnancy, childbirth, and related medicalneeds-ensuring every parent has the support they need during thisimportant life moment.8-weeks of paid parental leave for allparents. Additional paid pregnancy leave for CA employees
• Meals & Catering: Frequently cateredlunches and team meals, plus company-covered meals when extra timeor effort is required
• Snacks & Beverages: Fully stockedkitchen with unlimited snacks and drinks to keep you fueledthroughout the day
• Performance & Fitness: $100 monthlyfitness stipend to support peak performance and health, both insideand outside of work
• EV Charging: Onsite electric vehiclecharging available for employees