Embedded Software Engineer Torrance, CA Engineering

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.

Embedded Software Engineer

As an Embedded Software Engineer you will be at the forefront of creating, developing, and testing the software that drives and simulates our flight systems. Your role involves close collaboration with fellow Castelion engineers across software and hardware domains to implement and debug software across the entire technology stack from applications and operating systems to networking, firmware, and simulation, ensuring complete mission success.

We seek intelligent, collaborative, and driven engineers of all levels who are passionate about problem-solving and eager to contribute to an extraordinary mission. If you thrive in challenging environments and are excited by the prospect of making a tangible impact, we want to hear from you.

Responsibilities

• Autonomous Systems:
  Design and implement reliable autonomous software systems, along with the simulations required to validate their precision and dependability.
• Comprehensive Software Development:
  Manage the entire software development process, from initial design, prototyping, and testing, to final integration and deployment for mission-critical applications.
• System Testing:
  Evaluate test outcomes and troubleshoot issues necessitating detailed investigations, including hands‑on integration and debugging of hardware/software systems. Develop tools to facilitate testing across various environments: virtualized hardware, real hardware‑in‑the‑loop, and vehicle‑in‑the‑loop testing.
• Collaboration:
  
  Partner with multidisciplinary engineering teams to brainstorm, design, and develop next‑generation hypersonic missile capabilities, including advanced guidance algorithms and integrated seeker image processing.
• Project Leadership:
  Lead major projects that propel Castelion's mission forward, ensuring alignment with overall objectives and occasionally traveling to launch and customer sites for testing and operations.
• Enhance Standards and Practices:
  Continuously improve software standards and best practices within the software team, fostering an environment of ongoing improvement and innovation.

Basic Qualifications

• Educational Background:
  
  Bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, Mathematics, or a related STEM field, or equivalent practical experience.
• Experience:
  
  Open to candidates across all experience levels, from early‑career engineers to senior technical contributors. Professional experience, internships, research, open‑source contributions, or other hands‑on technical work will be considered.
• Technical Proficiency:
  
  Experience with systems programming in languages such as C++, Python, or Rust, and familiarity with Linux‑based development environments. Experience may include work with low‑level systems such as Linux kernel development, hardware interfaces, or driver development (e.g., UART, I2C, or similar peripherals).

Preferred Skills and Experience

• Programming Expertise:Proven proficiency in C++, Rust, or similar systems programming languages.
• System
  
  Experience:
  
  Practical experience with real‑time embedded systems or distributed computing environments in Linux‑based systems, including developing high‑quality Linux‑based C++ software for common processors and microcontrollers…