Electrical Engineer Intern Avionics

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.

Electrical Engineer Intern
- Spring 2027 (Avionics)

Castelion is seeking motivated and talented Electrical Engineering Interns for Spring 2027. You'll help design, build, and test the electronics and hardware that drive our advanced missile systems. From architecture and schematic design to board bring-up and validation, you'll own real hardware projects alongside experienced hardware, firmware, and systems engineers. You won't be doing throwaway work. Your contributions will directly support rapid prototyping and real-world flight tests.

Key Responsibilities

• Take ownership of circuit board design from specification and architecture through schematic, layout collaboration, bring-up, and validation
• Design and integrate analog and digital circuits, processors, sensors, and power electronics
• Collaborate cross-functionally with PCB layout, firmware, mechanical, systems, and test teams
• Rapidly iterate hardware designs as system requirements mature
• Document design decisions, calculations, schematics, validation results, and learnings clearly
• Support system bring-up, debug, and test campaigns in the lab and on hardware-in-the-loop benches

Basic Qualifications

• Currently pursuing a BS or MS in Electrical Engineering, Computer Engineering, Mechatronics, or a related field
• Strong understanding of analog and digital circuit design principles
• Experience with PCB component selection and schematic design
• Familiarity with PCB bring-up and debugging
• Some exposure to MATLAB, Python, C/C++, or other tools for modeling and analysis
• Basics of serial communication protocols (CAN, Ethernet, SPI, I2C, etc.)
• U.S. Person status required (due to ITAR regulations)

Preferred Skills and Experience

• Prior project or internship experience designing and testing PCBAs for aerospace, robotics, automotive, or other high-reliability applications
• Familiarity with mixed-signal design, power electronics, or RF systems
• Strong interest in working in a startup environment with high-impact projects.

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…