{"id":2985237,"url":"https://alion.io/job/castelion-gnc-engineer-actuation-systems","title":"GNC Engineer - Actuation Systems","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":["Rio de Janeiro, Brazil"],"countries":["BR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":39000,"max_usd":101000,"period":"year","method":null,"sample_n":688},"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}],"status":"live","first_seen_at":"2026-09-07T17:10:57Z","employer_posted_date":"2026-09-16","last_verified_at":"2026-10-26T18:54:58Z","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 - Actuation Systems\nAs a GNC Engineer focused on actuation systems at Castelion, you will build the control algorithms, models, and software that turn vehicle commands into precise physical motion.\nYou will own problems across actuator modeling, closed-loop control, system identification, hardware characterization, simulation, and flight integration. Depending on your experience, you may contribute to individual control loops or take ownership of complete actuation systems from requirements and architecture through hardware testing and flight.\nThis role is a strong fit for engineers who enjoy controls, electromechanical systems, hands-on testing, and seeing algorithms directly affect hardware performance.\nResponsibilities\nDesign, implement, and tune closed-loop control systems for flight vehicle actuators\nDevelop position, velocity, force, torque, and current control architectures as required by the actuator system\nModel electromechanical actuator dynamics, including motors, transmissions, ball screws, control surfaces, sensors, structural loads, friction, backlash, saturation, and other nonlinear effects\nDevelop actuator performance requirements and support motor, gearing, sensor, and mechanical hardware sizing\nPerform stability, bandwidth, robustness, disturbance rejection, and tracking performance analysis\nDevelop feedforward, filtering, compensation, anti-windup, command shaping, and other control features to improve actuator performance\nPerform system identification and parameter estimation using component, bench, and integrated test data\nBuild actuator models for high-fidelity vehicle and 6-DOF simulations\nImplement control algorithms in embedded flight software and support real-time execution constraints\nDevelop Software-in-the-Loop (SITL) and Hardware-in-the-Loop (HITL) test environments for actuator validation\nPlan and execute hardware characterization and closed-loop actuator testing\nAnalyze test and flight data to validate models, identify performance limitations, and improve control designs\nWork closely with GNC, avionics, embedded software, mechanical, electrical, and test engineers to deliver integrated flight-ready actuation systems\nBasic Qualifications\nBachelor's degree in Aerospace Engineering, Mechanical Engineering, Electrical Engineering, Computer Engineering, or a related technical field\nStrong fundamentals in feedback controls, dynamics, or electromechanical systems\nExperience programming in Python, Rust, C/C++, Julia, or a similar technical computing language\nExperience analyzing dynamic systems through coursework, research, internships, projects, or professional work\nAbility to work effectively across software, electrical, mechanical, and controls disciplines\nPreferred Skills and Experience\nExperience designing and tuning closed-loop control systems for electromechanical or aerospace hardware\nExperience with motor control, servo systems, position control, velocity control, force control, or torque control\nExperience modeling DC, BLDC, or PMSM motors and their associated drive electronics\nExperience with mechanical transmission systems such as gearboxes, ball screws, linkages, or rotary-to-linear mechanisms\nStrong understanding of classical control techniques, including loop shaping, gain and phase margin, bandwidth, and frequency-domain analysis\nExperience with state-space controls, observers, feedforward control, or disturbance estimation\nExperience with nonlinearities including saturation, rate limits, deadband, backlash, friction, hysteresis, and compliance\nExperience with system identification and correlation of analytical models against hardware test data\nExperience with embedded or real-time control software\nExperience with sensors such as encoders, resolvers, current sensors, load cells, or position transducers\nExperience with actuator sizing, power requirements, thermal constraints, structural loads, or performance trades\nExperience developing simulation models for actuator dynamics and integrating them into larger vehicle simulations\nExperience with Monte Carlo analysis, uncertainty analysis, or robustness assessment\nExperience with Software-in-the-Loop (SITL) or Hardware-in-the-Loop (HITL) testing\nExperience designing or operating test stands and working directly with flight-like hardware\nExperience supporting aerospace, robotics, automotive, industrial automation, or other high-performance motion-control 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":7530,"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":0.393,"p_room":0.28,"age_days":48,"expected_fill_days":22,"reasons":["conf:1","velocity","win:tail","crowd:brand"],"computed_at":"2026-10-26T05:57:25Z"},"pay":null,"html_url":"https://alion.io/job/castelion-gnc-engineer-actuation-systems","json_url":"https://alion.io/job/castelion-gnc-engineer-actuation-systems.json","meta":{"generated_at":"2026-10-26T22:23:39Z","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":30365,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-27T00:00:00Z"}},"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-actuation-systems"},{"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-actuation-systems"},{"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-actuation-systems"},{"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-actuation-systems\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcastelion-gnc-engineer-actuation-systems"}]}