Senior Guidance Systems 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. Senior Guidance Systems Engineer We are seeking a Senior Guidance Engineer to develop guidance solutions for Castelion's long-range hypersonic strike vehicles. This role is critical in shaping the flight performance of our hypersonic systems from concept through flight tests and operational deployment. You will work hands-on with multidisciplinary engineering teams to design, analyze, characterize, and validate guidance algorithms in a rapid hardware-driven environment. Responsibilities • Lead the design and optimization of hypersonic flight vehicle guidance methods to maximize performance, stability, and maneuverability in atmospheric and space environments • Conduct trajectory and flight simulations to evaluate guidance system performance, identify improvement opportunities, and validate design decisions • Analyze and enhance the inertial and active guidance of Castelion's long-range hypersonic systems, ensuring robust performance under variable environmental conditions • Work closely with teams in avionics, seeker, flight software, and GNC to ensure seamless vehicle integration • Help define and execute test plans for subscale and full-scale flight tests, translating results into system-level design improvements • Mentor and guide junior engineers in best practices • Partner closely with program leadership to make technical trades aligned with mission success Basic Qualifications • Bachelor's, Master's, or PhD in Aerospace Engineering or related field • 3+ years of experience in guidance system design, analysis, and validation for high-speed vehicles (missiles, rockets, hypersonic glide vehicles, or maneuvering re-entry systems) • Demonstrated ability to field guidance systems for DoD or similar programs • Strong background in trajectory/flight simulation (3DOF and 6DOF) and real-time trajectory generation/optimization methods • Experience with onboard trajectory generation approaches • Familiarity with the application of AI/deep learning to trajectory optimization • Proficiency in flight/trajectory analysis tools such as TAOS, POST, or equivalent • Strong problem-solving mindset, thriving in a fast-paced, hardware-rich, high flight cadence environment 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.