{"id":253914,"url":"https://alion.io/job/cesiumastro-guidance-navigation-control-gnc-engineer-ii","title":"Guidance, Navigation, & Control (GNC) Engineer II","company":{"id":5315,"name":"CesiumAstro","domain":"cesiumastro.com","url":"https://alion.io/company/cesiumastro","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":85,"open_postings":40,"ghost_share":0,"stale_share":0.6,"repost_share":0.025,"time_to_fill_p50_days":48,"computed_at":"2026-11-11T05:49:22Z"}},"role":"Aerospace","role_family":"Aerospace","seniority":"middle","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Westminster, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":113000,"max":136400,"currency":"USD","period":"year","gross":null,"usd_annual":136400},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"GMAT","optional":false},{"name":"Python","optional":false},{"name":"STK","optional":false}],"status":"live","first_seen_at":"2026-08-24T14:30:54Z","employer_posted_date":"2026-08-24","last_verified_at":"2026-11-11T06:35:14Z","board_verified":true,"closed_at":null,"days_open":78,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":78},"description":"We are looking to add a GNC Engineer II to our team. If you enjoy working in a startup environment and are passionate about developing systems for leading-edge spacecraft, and aerospace communication systems, we would like to hear from you.\nIn this position, you will work on a small team in the design and analysis of GNC systems for CesiumAstro satellites and payloads. You will be responsible for Guidance, Navigation, and Control through all stages of design, integration, test, and operations. As such, you will perform trade studies, participate in design reviews, create models, and complete simulations and system testing. You will build, test, and fly hardware.\nAs a CesiumAstro spacecraft team member, you will work on a small team to develop satellites and put them in orbit. Being in a startup, you can expect significant portions of your time to be spent contributing to company-critical projects outside your area of expertise.\nKEY REQUIREMENTS:\nMaster of Science (MS), or Doctorate (Ph.D.) degree in Aerospace Engineering from an accredited university or institution \n2 years of internship, research, or industry experience in satellite attitude and orbit systems \nExpertise in attitude estimation, guidance, and control; coordinate frame transformations; linear algebra; and non-linear systems \nExperience with multiple spaceflight missions from concept to operations \nExperience in low earth orbit satellites \nExperience with post-CDR test failures and on-orbit failures that guide your design and test philosophies \nExperience with successful and unsuccessful recovery from on-orbit failures \nExperience in conceptualization, architecture design, requirements specification, design, test, and operations of various GNC architectures and components \nFamiliarity with space mission simulation tools such as STK, Basilisk, GMAT, or FreeFlyer \nExperience defining spacecraft trajectories and orbital requirements \nFluency with Python and C++, or other modeling languages \nFamiliarity with spacecraft mission design including events, pointing modes, maneuver planning, and operations \nExcellent written and verbal communication skills \nPREFERRED EXPERIENCE:\nCubeSat and SmallSat experience \nHands-on experience with spacecraft instrumentation, subsystems, and test labs \nExperience with multiple mission simulation and flight architectures which drives your vision for the next generation of space software \nExperience in LEO, MEO, GEO, and deep space satellites \nExperience with communications 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