{"id":254146,"url":"https://alion.io/job/cesiumastro-senior-propulsion-engineer-i","title":"Senior Propulsion Engineer I","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":"2026-11-10T06:52:35Z"}},"role":"Aerospace","role_family":"Aerospace","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":["El Segundo, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":140000,"max":168000,"currency":"USD","period":"year","gross":null,"usd_annual":168000},"salary_estimate":null,"experience_years_min":4,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Siemens NX","optional":false},{"name":"SolidWorks","optional":false},{"name":"ANSYS","optional":true},{"name":"GD&T","optional":true},{"name":"MATLAB","optional":true}],"status":"live","first_seen_at":"2026-06-03T17:42:40Z","employer_posted_date":"2026-06-03","last_verified_at":"2026-11-10T05:13:26Z","board_verified":true,"closed_at":null,"days_open":159,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":159},"description":"We are seeking a Senior Propulsion Engineer I to lead the design, development, analysis, and testing of critical liquid rocket engine hardware and propulsion subsystems. This role offers the opportunity to take ownership of complex flight hardware from concept development through qualification and flight readiness.\nJOB DUTIES AND RESPONSIBILITIES\nDesign and develop a variety of liquid rocket engine parts, including loading frames, gimbals, bellows units, and pipelines. Perform calculations and analyses with team support.\nOwn requirements definition, architecture trades, and system-level integration for assigned subsystems.\nGenerate technical documentation, including reports, specifications, and contributions to PDRs and CDRs.\nPerform CFD and FEA analyses to evaluate performance parameters such as pressure drops and hydraulic characteristics and mechanical integrity under operating conditions.\nDevelop and execute test programs, analyze experimental data, and apply findings to optimize designs.\nCollaborate across mechanical, aerospace, and controls engineering teams to deliver flight-ready hardware.\nJOB REQUIREMENTS AND MINIMUM QUALIFICATIONS\nBachelor’s degree in Mechanical Engineering, Aerospace Engineering, or a related field.\n4+ years of experience with mechanical design, development, fabrication, assembly, or test.\nHands-on proficiency in CAD tools (Siemens NX, SolidWorks).\nDemonstrated expertise in structural or mechanical design for flight hardware.\nExperience in early-stage vehicle architecture and design trades.\nStrong analytical and problem-solving skills with high attention to detail.\nWilling to make mistakes, take responsibilities, work independently and be transparent about your work.\nExcellent written and verbal communication skills.\nPREFERRED EXPERIENCE\nPrior experience designing a variety of liquid rocket engine parts, including loading frames, gimbals, bellows units, and pipelines.\nPractical experience in test bench setup and performance diagnostics.\nHands-on engineering (Full-stack: computer to wrench to broom).\nGeometric dimensioning and tolerancing (GD&T).\nFamiliarity with aerospace safety and reliability practices.\nExperience in a start-up or rapid development environment.\nExperience with tools such as ANSYS and 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