Embedded Software Engineer Intern - Summer 2026 (Avionics)

Castelion is seeking motivated and talented Embedded Software Engineering interns for Summer 2026. You'll help create the software that drives and simulates our missile systems, from low-level firmware on microcontrollers to high-level integration and testing tools.

Requirements

• Develop, test, and debug low-level firmware for embedded systems and flight hardware
• Write and integrate device drivers for sensors, actuators, and missile subsystems
• Bring up new hardware, test boards, and debug at the intersection of electrical and software layers
• Collaborate cross-functionally with hardware, GNC, and flight test teams to ensure robust integration
• Participate in design reviews, hardware-in-the-loop tests, and on-the-bench bring-up and validation
• Document your work clearly and share learnings to improve team knowledge and future designs

Benefits

• Paid internship at $30 per hour
• Housing or relocation stipends may be available for non-local interns
• Opportunity to work on high-impact projects and contribute meaningfully to the success of our programs