{"id":177712,"url":"https://alion.io/job/cesiumastro-senior-flight-software-engineer","title":"Senior Flight Software Engineer","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":87,"open_postings":31,"ghost_share":0,"stale_share":0.516,"repost_share":0,"time_to_fill_p50_days":47,"computed_at":"2026-10-20T05:45:00Z"}},"role":"Hardware","role_family":"Hardware","seniority":"senior","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":133000,"max":161000,"currency":"USD","period":"year","gross":null,"usd_annual":161000},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"CI/CD","optional":false},{"name":"Linux","optional":false},{"name":"Python","optional":false},{"name":"TCP/IP","optional":false},{"name":"NASA cFS","optional":true}],"status":"live","first_seen_at":"2026-08-30T23:58:04Z","employer_posted_date":"2026-08-30","last_verified_at":"2026-10-20T10:15:53Z","board_verified":true,"closed_at":null,"days_open":50,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":50},"description":"We are looking to add a Senior Flight Software Engineer II to our Internal Missions team. If you enjoy working in a startup environment and are passionate about developing software for leading-edge communications satellites, we would like to hear from you.\nIn this position, you will be responsible for the CesiumAstro satellite flight software and software-in-the-loop testing through all stages of the development process. Your work will include developing software to monitor, test, and control spacecraft subsystems such as attitude, command and data handling, navigation, thermal, and power. The ideal candidate will be an experienced spacecraft software engineer, motivated to develop every aspect of space mission software from Linux-based satellite operating systems to low-level embedded products. You will work and learn from a cohort of senior and principal software engineers. You will use your experience to direct, mentor, and grow a team of motivated spacecraft engineers in the development of a new satellite system.\nAs a CesiumAstro team member, you will work on a small team to develop satellites and put them in orbit. You will be responsible for software design to include initial architecture and block diagrams, requirements definition, implementation, code review, and validation and verification. You will need to identify simplifying solutions to simulate complex problems and explain key results and decisions to the team.\nJOB DUTIES AND RESPONSIBILITIES\nDesign and implement software to build and integrate mission systems including satellites, ground stations, and mission operations centers.\nDesign, develop, code, test, debug, and document system software.\nReview code and system designs.\nAnalyze code for efficiency, stability, and scalability.\nIntegrate and validate new product designs.\nSupport software quality assurance and optimize I/O performance.\nProvide post-production/in-orbit customer support.\nInterface with hardware design and development engineers.\nAssess third party and open-source software.\nJOB REQUIREMENTS AND MINIMUM QUALIFICATIONS\nBachelor of Science (BS), Master of Science (MS), or Doctorate (PhD) degree in Software or Computer Engineering from an accredited university or institution. \nMinimum of 5 years of industry experience in spacecraft software development. A Master's degree may count as two years of experience.\nExperience in hands-on development and troubleshooting of software systems and hardware (such as motors, power distribution units, etc.).\nExperience with C, C++, Python, or other languages in an aerospace context. \nA strong understanding of space missions from conception through flight and disposal. \nFamiliarity with spacecraft mission design including events, pointing modes, maneuver planning, sequencing, and operations. \nExperience with spacecraft failure in post-CDR testing and on-orbit, root cause analysis, and recovery. \nExperience with design for reliability, spaceflight redundancy, and fault detection, identification, and recovery. \nSpace software experience with attitude dynamics, coordinate frame transformations, vector mathematics, radiative heat transfer, spacecraft propulsion, space communication systems, and power systems. \nExperience with communication protocols such as TCP/IP or UDP for use in software-in-the-loop and hardware-in-the-loop lab development and for use in space flight. \nExperience in interfacing a variety of open-source software to create an integrated system.\nEmbedded software experience, particularly for space missions. \nAbility to implement physical first principles as scripts or spreadsheets. \nExperience with processes for software release, revisioning, and configuration. \nFamiliarity with configuration management tools, defect tracking tools, and peer review. \nExperience with trades and processes for handling radiation tolerance in software on automotive grade parts.\nFamiliarity with systems for continuous integration, test, and delivery. \nExcellent understanding of multi-threaded applications and resource management.\nExcellent written and verbal communication skills. \nPREFERRED EXPERIENCE\nCubeSat and SmallSat experience including LEO, MEO, GEO, and beyond. \nHands-on experience with spacecraft instrumentation, subsystems, and test labs. \nExperience with JPL F’, NASA cFS, and other commercial space software frameworks. \nExperience with ground system software engineering for space missions. \nExperience in a team leadership role on a space software program. \nExperience in other non-space safety critical software programs. \nExperience with network security.","description_format":"text","description_chars":4601,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Space & Aerospace","Satellite Communications"],"lifecycle":[{"event":"open","at":"2026-08-31T00:13:11Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 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