Avionics Systems Integration Engineer, Senior Torrance, CA Flight Sciences

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.

Senior Avionics Systems Integration Engineer

Join Castelion and play a pivotal role in advancing the development of next-generation hypersonic missile systems. As a Senior Avionics Systems Integration Engineer, you'll be part of a cross-disciplinary team responsible for the seamless integration of avionics systems across design, development, testing, and operations. You'll directly impact mission-critical systems that shape national defense and peace through deterrence.

Responsibilities

• Lead the integration and operational readiness of avionics systems from initial design and assembly through testing and field operations
• Diagnose, troubleshoot, and resolve electrical hardware issues under aggressive development timelines while driving long-term improvements
• Support hardware-in-the-loop (HIL) testing, flight operations, and post-flight assessments, ensuring real-time system health monitoring and issue resolution
• Collaborate cross-functionally to optimize avionics architectures, reducing mass, cost, and complexity through innovative solutions
• Contribute to the development and validation of advanced avionics capabilities, including power systems, sensors, vehicle networks, RF, and control systems

Basic Qualifications

• Bachelors degree in engineering, physics, or a related technical field
• 5+ years of experience in electrical component design, system integration, or electronic testing
• 1+ years of experience using software tools such as MATLAB, Python, or C++
• Vehicle harnessing experience

Preferred Skills and Experience

• Proficiency with electrical test equipment (multimeters, oscilloscopes, power supplies, etc.)
• Creative problem-solving mindset with the ability to balance risk and make sound decisions
• Experience diagnosing and repairing avionics systems, including sensors and actuators
• Familiarity with 3D CAD tools
• Software skills to automate test or analysis processes
• Strong organizational and communication skills with the ability to thrive in a dynamic, fast-paced environment
• Real-time operations experience in complex systems such as flight tests or other high-consequence environments

Additional Requirements

• Ability to work onsite and support testing at remote facilities as needed.
• Willingness to travel occasionally to support test campaigns and customer engagements.

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…