{"id":2985171,"url":"https://alion.io/job/castelion-gnc-engineer","title":"GNC Engineer","company":{"id":1795053,"name":"Castelion","domain":"castelion.com","url":"https://alion.io/company/castelion","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":null},"role":"Aerospace","role_family":"Aerospace","seniority":null,"employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":92000,"max_usd":215000,"period":"year","method":"role_country_seniority_unknown","sample_n":590},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Human-in-the-Loop","optional":false},{"name":"Julia","optional":false},{"name":"Python","optional":false},{"name":"Rust","optional":false},{"name":"Inertial Navigation","optional":true},{"name":"Sensor Fusion","optional":true}],"status":"live","first_seen_at":"2026-09-07T17:10:40Z","employer_posted_date":"2026-09-21","last_verified_at":"2026-10-27T12:48:54Z","board_verified":true,"closed_at":null,"days_open":49,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":49},"description":"Why Castelion, Why Now \nCastelion 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. \nThis 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. \nGNC Engineer\nAs a GNC Engineer at Castelion, you will build the algorithms, models, and software that make our vehicles fly.\nYou will work across guidance, navigation, flight controls, and high-fidelity simulation to solve difficult problems in high-speed flight. Depending on your strengths and interests, you may focus deeply in one area or work across several. You will take ideas from analysis and simulation through software, hardware testing, and flight.\nThis role is ideal for engineers who want broad ownership, hard technical problems, and a direct connection between their work and vehicle performance.\nResponsibilities\nDevelop and tune flight control algorithms for stability and performance across a challenging flight envelope\nDevelop guidance algorithms for trajectory shaping and mission execution\nDevelop navigation and state estimation algorithms\nModel and analyze actuation systems, including aerodynamic control surfaces and electromechanical actuators\nBuild and improve high-fidelity 6-DOF simulations of vehicle flight\nModel vehicle dynamics, aerodynamics, propulsion, sensors, actuators, and environmental effects\nImplement and test GNC algorithms in flight software\nSupport Monte Carlo, Software-in-the-Loop (SITL), and Hardware-in-the-Loop (HITL) test environments\nSupport vehicle sizing, performance analysis, and hardware requirements\nSupport flight test planning, prediction, execution, and post-flight analysis\nUse simulation, hardware, and flight data to improve models and vehicle performance\nBasic Qualifications\nBachelor's degree in Aerospace Engineering, Mechanical Engineering, Electrical Engineering, Computer Engineering, or a related technical field\nFamiliarity with aerodynamics, flight dynamics, and rigid-body dynamics\nStrong fundamentals in dynamics, controls, estimation, numerical methods, or simulation\nStrong programming skills in Rust, C/C++, Python, Julia, or a similar language\nDemonstrated ability to solve technical problems through coursework, research, internships, projects, or professional experience\nAbility to communicate technical results clearly and work effectively with multidisciplinary engineering teams\nPreferred Skills and Experience\nExperience with flight controls, guidance, navigation, estimation, actuation, or vehicle simulation\nExperience designing or analyzing feedback control systems\nExperience with Kalman filtering, sensor fusion, or inertial navigation\nExperience with trajectory optimization, guidance, or optimal control\nExperience building 6-DOF or other nonlinear dynamic simulations\nExperience modeling or controlling electromechanical or aerospace actuation systems\nExperience with embedded or real-time software\nExperience with Monte Carlo analysis, uncertainty analysis, or model validation\nExperience with SITL or HITL testing\nExperience analyzing test or flight data\nHands-on experience with rockets, UAVs, robotics, Formula SAE, research vehicles, or other complex hardware systems\nCastelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details. \nOther Duties \nPlease 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. \nAdditional Eligibility Requirements \nThis 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. \nAffirmative Action/EEO Statement \nCastelion 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. \nCastelion 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 . Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law. \nCastelion 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. \nEAR/ITAR Requirements \nThis 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.","description_format":"text","description_chars":6057,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":true,"languages":[]},"benefits":[],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Missiles","Defense Manufacturing"],"lifecycle":[{"event":"open","at":"2026-10-21T08:14:48Z"}],"visa":[],"liveness":{"score":11,"band":"cold","label":"Long shot","p_open":1,"p_active":0.401,"p_room":0.28,"age_days":49,"expected_fill_days":22,"reasons":["conf:1","velocity","win:tail","crowd:brand"],"computed_at":"2026-10-27T05:46:45Z"},"pay":null,"html_url":"https://alion.io/job/castelion-gnc-engineer","json_url":"https://alion.io/job/castelion-gnc-engineer.json","meta":{"generated_at":"2026-10-27T15:03:18Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":3841,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-28T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":1795053},"rest":"https://alion.io/mcp/rest/get_company?id=1795053"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcastelion-gnc-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fcastelion-gnc-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fcastelion-gnc-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/castelion-gnc-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcastelion-gnc-engineer"}]}