Mission Integration Engineer

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. Mission Integration Engineer As a Mission Integration Engineer, you will be the primary technical liaison between Castelion and our government customers, supporting the integration of advanced weapons systems into operational environments. You will drive the entire lifecycle of weapons programs, from early capability studies through prototype development, test, and operational deployment. This role requires a combination of deep technical expertise, strong program execution skills, and the ability to engage directly with government stakeholders. You will work closely with internal teams across engineering disciplines including propulsion, avionics, guidance/navigation/control (GNC), software, flight test, and manufacturing to ensure mission success. Responsibilities • Serve as a customer interface, ensuring alignment between government mission requirements and Castelions weapon system designs. • Support all phases of the program from concept development and initial proposals through successful test, flight, and deployment. • Lead mission planning and test efforts, ensuring end-to-end system integration and operational readiness. • Work across internal teams to develop and execute prototype development strategies, ensuring timely delivery of cutting-edge weapons solutions. • Collaborate with engineers and leads to optimize weapons system performance through design trades and cross-discipline coordination. • Represent Castelion at customer meetings, design reviews, test campaigns, and technical demonstrations. • Ensure contract deliverables are met on time and to customer specifications. • Provide technical leadership in weapons system verification and test planning, ensuring robust validation and mission success. • Support live-fire and flight test operations, including pre-test analysis, real-time mission support, and post-test evaluation. • Maintain an in-depth understanding of government acquisition processes, certification requirements, and compliance standards. Basic Qualifications • Strong passion for advancing national security and a deep commitment to developing cutting-edge defense technologies to support the warfighter. • Bachelor's degree in aerospace engineering, mechanical engineering, electrical engineering, physics, or a related technical field. • 2+ years of experience in systems engineering, mission integration, or related roles within the defense or aerospace industry. • 2+ years of experience in technical project management and/or weapons system development. • Experience working with DoD or other national security agencies. • Hands-on experience with launch vehicles, weapons systems, or other aerospace defense platforms. • Strong ability to analyze and synthesize complex technical information and communicate effectively with both engineers and external stakeholders. • Ability to obtain and maintain a Top Secret/SCI security clearance Preferred Qualifications • Masters degree in a relevant technical field. • Experience with hypersonic weapons, missile defense, or advanced guidance systems. • Strong background in spacecraft or missile mission design, development, integration, and/or test. • Ability to work under pressure and manage multiple parallel priorities effectively. • Highly detail-oriented with strong analytical, verbal, and written communication skills. • Active Top Secret/SCI security clearance preferred. 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.