{"id":3378629,"url":"https://alion.io/job/endurosat-senior-thermal-engineer-endurosat","title":"Senior Thermal Engineer - EnduroSat","company":{"id":55463,"name":"EnduroSat","domain":"endurosat.com","url":"https://alion.io/company/endurosat","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"JazzHR","truth_index":null},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Sofia, Bulgaria"],"countries":["BG"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":39000,"max_usd":88000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":8444},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"ECSS","optional":false},{"name":"Siemens NX","optional":false},{"name":"Thermal Desktop","optional":false}],"status":"live","first_seen_at":"2026-10-28T03:50:29Z","employer_posted_date":"2026-10-28","last_verified_at":"2026-11-05T20:33:57Z","board_verified":true,"closed_at":null,"days_open":8,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":8},"description":"About us\nWe are EnduroSat! A fast-growing space scale-up at the forefront of satellite innovation, specializing in advanced software-flexible satellites for commercial, governmental, and scientific endeavors.\nThis is more than a job, it`s a missionWe are making space universally accessible and redefining the possible\n\nWe get things doneWe take ownership of what we do and we work hard to make a difference\n\nWe are fearlessTranspаrancy is our only way forward. We dare to address and resolve issues head-on\n\nWe learn from our mistakesWe deliver, take informed risks, and evolve to achieve our goals. We compare with the best version of ourselves\n\nWhat is the role?\nAs a Senior Thermal Engineer you will be responsible for the thermal engineering activities related to spacecraft design, manufacturing, testing, launch, and operations. Your activity may include the design, development, and qualification of EnduroSat generic satellite platforms, and/or satellites for specific customers. You will be part of EnduroSat’s system engineering team and you will participate in the full spacecraft lifecycle, from initial design to AIT, launch, and flight operations. You also may be required to participate in technical meetings with customers, under the leadership of the system engineer.\nSome of your daily tasks will include:\nDefine thermal architecture (radiators blankets heaters etc.)\nBuild thermal models\nCompute thermal predictions for flight (hot case, cold case) and TVAC testsCorrelate models with test results\nIdentify test success criteria\nCompute thermal power consumption\n\nInvestigation and closure of all issues related to thermal behavior\nWhat do we look for?\nMaster of Science in aerospace engineering or mechanical/thermal engineering (or equivalent)\nExcellent technical background in at least satellite Thermal engineering\nHands-on experience with spacecraft thermal analysis software such as Thermal Desktop, Comsol, ESATAN-TMS, or Systema/Thermica\nOpenness to knowledge sharing and willingness to mentor junior engineers\nUnderstanding the importance of the last-mile delivery\nHave excellent communication skills and a positive attitude\nHow to stand out?\n5+ years experience in Space programs engineering\nBackground in nano satellites and small satellites\nThorough understanding of of thermal systems\nExperience with COMSOL Multiphysics, Siemens NX Space Systems Thermal, or SINDA/FLUINT\nHands-on experience with TVAC testing and thermal model correlation\nFamiliarity with ECSS thermal standards (e.g. ECSS-E-ST-31C)\nWhy EnduroSat?\nFast-paced and delivery-focused cultureWe work with well-defined quarterly based objectives, that allow us to fast track the progression of our work and improve as we go\n\nTough engineering challenges & hard-core R&DYou will be able to work on unique space technology and build next-gen innovations, while mentored by world-recognized space experts\n\nConstant learning and progressionOwn your personal growth by navigating through our career progression framework and educational programs\n\n Chance to join our space educational programMeet international space experts and improve your knowledge and skillset with our hands-on educational program\nAt EnduroSat, we embrace diversity and strive to create an inclusive environment where everyone is treated with fairness and respect. We are committed to equal employment opportunities without discrimination against any employee or job applicant on the basis of race, color, religion, sex, national origin, age, disability, sexual orientation, or gender identity. 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