Senior Systems Engineer

Senior Guidance Systems EngineerCastelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not just concepts.This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact.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.ResponsibilitiesLead the design and optimization of hypersonic flight vehicle guidance methods to maximize performance, stability, and maneuverability in atmospheric and space environmentsConduct trajectory and flight simulations to evaluate guidance system performance, identify improvement opportunities, and validate design decisionsAnalyze and enhance the inertial and active guidance of Castelion's long-range hypersonic systems, ensuring robust performance under variable environmental conditionsWork closely with teams in avionics, seeker, flight software, and GNC to ensure seamless vehicle integrationHelp define and execute test plans for subscale and full-scale flight tests, translating results into system-level design improvementsMentor and guide junior engineers in best practicesPartner closely with program leadership to make technical trades aligned with mission successBasic QualificationsBachelor's, Master's, or PhD in Aerospace Engineering or related field3+ 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 programsStrong background in trajectory/flight simulation (3DOF and 6DOF) and real-time trajectory generation/optimization methodsExperience with onboard trajectory generation approachesFamiliarity with the application of AI/deep learning to trajectory optimizationProficiency in flight/trajectory analysis tools such as TAOS, POST, or equivalentStrong problem-solving mindset, thriving in a fast-paced, hardware-rich, high flight cadence environmentOther duties may be assigned.Benefits And PerksAll full-time employees are granted meaningful long-term equity, sharing in the company's significant growth trajectory. We offer four (4) weeks of paid time off, ten (10) company-paid holidays, and comprehensive health benefits - including 100% employee-covered medical and strong dependent coverage, along with dental and vision plans. We also provide paid parental leave to support growing families, a $100 monthly fitness stipend to promote health and performance, and onsite EV charging for convenience. In addition, employees enjoy perks like catered meals, company-covered food during high-demand periods, and a fully stocked kitchen to stay fueled throughout the day.While this position does not currently require a U.S government-issued security clearance, it may in the near future. Therefore, the ability to obtain and maintain a U.S. government–issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.