{"id":1738638,"url":"https://alion.io/job/orbital-paradigm-gnc-gnc-engineer","title":"GNC - GNC Engineer","company":{"id":2191709,"name":"Orbital Paradigm","domain":"orbitalparadigm.space","url":"https://alion.io/company/orbitalparadigm","size_band":"11-50","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Breezy","truth_index":{"grade":"A","score":95,"open_postings":8,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":141,"computed_at":"2026-10-12T06:55:09Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Madrid, Spain"],"countries":["ES"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":43000,"max_usd":83000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":15},"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"MATLAB","optional":false},{"name":"Simulink","optional":false},{"name":"C++","optional":true},{"name":"GMAT","optional":true},{"name":"Python","optional":true},{"name":"Rust","optional":true}],"status":"live","first_seen_at":"2026-06-17T13:23:27Z","employer_posted_date":"2026-06-17","last_verified_at":"2026-10-12T05:24:11Z","board_verified":true,"closed_at":null,"days_open":116,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":116},"description":"At Orbital Paradigm, we design, develop, manufacture, and operate reusable orbital logistics systems. Our spacecraft perform multiple orbital mission profiles and return safely to Earth through hypersonic atmospheric reentry and landing with pinpoint accuracy for rapid refurbishment and reuse.\nRole Description\nWe are looking for a Senior GNC Engineer to join the team in charge of the development, verification, and implementation of end-to-end guidance, navigation, and control capabilities for reusable orbital logistics vehicles.\nThe role covers the full GNC lifecycle, including mission analysis, trajectory design, guidance algorithms, navigation and estimation, control laws, flight dynamics, sensors and actuators modelling, simulation, verification, and support to flight software implementation. The engineer will work closely with systems, software, avionics, propulsion, aerodynamics, mechanical, and AIT teams to deliver robust GNC solutions across orbital operations, reentry, and landing.\nThis is a senior role requiring strong analytical depth, practical engineering judgment, autonomy, and the ability to deliver high-quality GNC work from concept through simulation, implementation, testing, qualification, and flight operations.\nKey Responsibilities\nDevelop, validate, and improve end-to-end GNC architectures for reusable spacecraft missions.\nDevelop guidance, navigation, estimation, and control algorithms for orbital operations, reentry, and landing phases.\nPerform mission analysis, trajectory design, flight dynamics analysis, and performance assessments.\nDevelop and maintain simulation environments for GNC design, verification, and validation.\nModel spacecraft dynamics, sensors, actuators, environmental disturbances, uncertainties, and failure cases.\nPerform Monte Carlo simulation campaigns, robustness analyses, sensitivity studies, and performance verification.\nDevelop and validate navigation and estimation algorithms, including Kalman filtering or equivalent methods.\nDevelop and validate control laws, including linear, nonlinear, robust, or adaptive control approaches as applicable.\nSupport implementation of GNC algorithms into flight software and embedded systems.\nSupport SIL, HIL, EGSE, and closed-loop test campaigns for GNC verification and qualification.\nDefine GNC requirements, interfaces, validation logic, and verification evidence.\nSupport sensor and actuator selection, characterization, calibration, and performance assessment.\nAnalyze test and flight data to validate models, update assumptions, and improve GNC performance.\nContribute to technical trade studies and system-level design decisions.\nSupport junior engineers through technical reviews, knowledge sharing, and day-to-day collaboration.\nPrepare and maintain technical documentation, simulation reports, verification reports, and review material.\nContribute to design reviews, test readiness reviews, qualification reviews, and flight readiness reviews.\nRequired Qualifications\n3-7 years of relevant professional experience in aerospace, automotive, or other high-performance industries.\nDegree in Aerospace Engineering, Control Engineering, Mechanical Engineering, Electrical/Electronic Engineering, Applied Mathematics, or a related technical field.\nSignificant professional experience in GNC, flight dynamics, control systems, robotics, aerospace systems, or another relevant high-performance engineering field.\nExperience developing GNC algorithms for aerospace systems, spacecraft, launch vehicles, missiles,\nStrong understanding of spacecraft dynamics, flight mechanics, estimation, control theory, trajectory design, and closed-loop system behaviour.\nProficiency with MATLAB/Simulink for modelling, simulation, analysis, and algorithm development.\nExperience with at least one of the following: Kalman filtering, nonlinear control, or spacecraft guidance and trajectory optimization\nExperience with onboard GNC implementation, flight software integration, or embedded real-time systems.\nExperience with Monte Carlo simulation, robustness analysis, uncertainty modelling, and performance verification.\nExperience with SIL and/or HIL testing for control, navigation, embedded software, or real-time systems.\nExperience modelling sensors, actuators, environmental disturbances, dynamics, and system uncertainties.\nAbility to translate mission and system requirements into GNC requirements, models, algorithms, and verification plans.\nExperience with GNSS, IMUs, star trackers, sun sensors, radar altimeters, air data sensors, reaction wheels, thrusters, or aerodynamic control surfaces.\nAbility to write clear technical documentation, analysis reports, test procedures, and verification reports.\nStrong problem-solving skills and ability to work autonomously on complex technical problems.\nAbility to work effectively across multidisciplinary engineering teams.\nFull proficiency in English, written and spoken.\nPreferred Qualifications\nPhD in advanced control techniques\nFamiliarity with aerospace industry standards such as ECSS, NASA, or MIL.\nExperience in a startup or small-company environment with fast design iterations.\nProficiency in C/C++ for algorithm prototyping, implementation, or flight software support.\nBasic proficiency with additional programming languages such as Python and Rust.\nExperience with reentry systems, launch vehicles, orbital maneuvering, reusable spacecraft, or precision landing systems.\nExperience with model-based design, automatic code generation, or real-time simulation environments.\nExperience with post-flight data analysis, system identification, model correlation, or flight operations support.\nFamiliarity with tools such as Python, GMAT, STK, Basilisk, Modelica, or equivalent mission analysis and simulation tools.\nGood proficiency in Spanish.\nWhat We Value\nExcellence in technical work, execution, and professional conduct\nStrong ownership mindset, with the ability to drive activities to clear outcomes through accountability, proactivity, and resourcefulness\nClear, efficient, direct, and constructive communication\nTeam-first attitude with low ego and strong cross-functional collaboration\nWhat We Offer\nLocation: Madrid, Spain (office-first)\nFlexible hybrid work (2 days/week from home + 2 fully remote weeks/year)\n30 vacation days (23 flexible, +7 during holidays).\nSalary depending on experience and profile\nRelocation package depending on seniority and profile\nFlexible compensation (meal vouchers, health insurance, public transport)\nCompany shares 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