Avionics Systems Integration Engineer, Senior

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 eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply. Affirmative Action/EEO Statement Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law. Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact hr@castelion.com. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law. Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation. EAR/ITAR Requirements This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.