Electrical Engineer Intern - Fall 2026 (Avionics)

Castelion is bringing a new approach to defense development and production, focusing on short, iterative design cycles and modern manufacturing strategies. They are seeking motivated Electrical Engineering Interns for Fall 2026 to help design, build, and test electronics for advanced missile systems.

What you'll do:

• 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

What they're looking for:

• 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)
• To conform to U.S. Government export regulations, the applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State
• 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

Benefits:

• This internship is paid at an hourly rate of $35 per hour.
• Compensation may vary based on experience and education level.
• For non-local interns, housing or relocation stipends may be available to help offset temporary living expenses.