Castelion · 2 days ago
Embedded Software Engineer Intern - Summer 2026 (Avionics)
Torrance, CA
Internship
Onsite
Intern
$30/hr - $30/hr
Start in 2026 SummerCastelion is a company focused on innovative defense development and production. They are seeking Embedded Software Engineering interns for Summer 2026 to assist in creating software for missile systems, working closely with experienced engineers to design, implement, test, and debug real systems.
AerospaceGovernmentManufacturingMilitaryNational Security
No H1B
U.S. Citizen Only
Responsibilities
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
Qualification
Required
Currently pursuing a BS or MS in Computer Engineering, Electrical Engineering, Computer Science, or a related technical field
Rising junior, senior, or graduate student at the time of the internship
Strong C/C++ programming skills for embedded systems
Experience with microcontrollers or SoCs (ARM, AVR, MSP430, PIC, etc.)
Familiarity with developing in bare-metal or RTOS environments
Understanding of board bring-up and debugging fundamentals
Some familiarity with common protocols: SPI, I2C, CAN, UART, Ethernet, etc
U.S. Person status required (due to ITAR regulations)
Preferred
Experience integrating analog/digital hardware with firmware
Familiarity with missile systems, defense technology, or aerospace components
Strong interest in working in a startup environment with high-impact projects
Benefits
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.
Company
Castelion
Castelion is a defense tech company that applies modern hardware development and manufacturing processes to national security challenges.
Founded in 2022
51-200 employees
Funding
Current Stage
Growth StageTotal Funding
$469.61MKey Investors
Lightspeed Venture PartnersSilicon Valley BankAndreessen Horowitz
2025-12-05Series B· $350M
2025-01-29Series A· $70M
2025-01-29Debt Financing· $30M
Leadership Team
Bryon Hargis
Founder // CEO
Andrew Kreitz
Co-Founder and CFO
Recent News
Tech Startups - Tech News, Tech Trends & Startup Funding
2025-12-09
Washington Technology
2025-12-09
alleywatch.com
2025-12-09
Company data provided by crunchbase