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Senior Avionics Systems Integration Engineer

Torrance, California, United States
Full Time On-site

Summary

Job Description

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.

Leadership Qualities

  • Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support.
  • High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion's mission and consistently look for ways to contribute to the company's technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.
  • Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.

About Castelion

Castelion

Castelion is one of the fastest-rising defense technology companies focused on building affordable, rapidly deployable hypersonic strike systems for the U.S. military. Founded by former SpaceX leaders, the company is working to modernize how advanced weapons are developed and manufactured—using rapid iteration, vertical integration, and scalable production to deliver next-generation deterrence capabilities faster than traditional defense programs. Castelion’s mission centers on restoring America’s ability to field advanced military technology at speed and scale.

For job seekers, Castelion offers the opportunity to work directly on some of the most advanced technologies in national defense, including propulsion systems, avionics, flight software, guidance and navigation, missile systems, and advanced manufacturing. The company hires across aerospace engineering, embedded software, manufacturing, test engineering, avionics, cybersecurity, and operations—making it especially attractive to engineers, builders, veterans, and mission-driven professionals who want hands-on ownership of real hardware.

Unlike traditional defense contractors, Castelion operates with a startup-style engineering culture modeled after rapid aerospace development environments. Employees work closely with flight hardware, testing, and production systems in a fast-paced setting where speed, accountability, and execution are prioritized. The company openly emphasizes a builder mentality—giving team members the chance to own major projects and contribute directly to systems with national security impact.

As the U.S. military increases investment in hypersonic weapons, missile modernization, and scalable deterrence capabilities, Castelion continues to grow rapidly through major government contracts and manufacturing expansion. For professionals seeking a high-growth aerospace and defense company where they can help shape the future of national security technology, Castelion is quickly becoming one of the most exciting employers in the defense innovation ecosystem.

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