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Salary
≈ $39k – $88k per year (Estimated)
Location
In office (Sofia)
Seniority
Senior · 5+ years exp

Confirmed on the employer's own hiring board on Oct 30, 2026. First seen by Alion on Oct 28, 2026.

Overview
Company
Impact
Profile match
EnduroSat is a Bulgarian space technology company founded in 2015 and based in Sofia. It builds modular nanosatellites and shared satellite services for commercial and scientific missions. The company has delivered spacecraft and components to customers worldwide.

About us

We 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.

  • This is more than a job, it`s a mission

    We are making space universally accessible and redefining the possible

  • We get things done

    We take ownership of what we do and we work hard to make a difference

  • We are fearless

    Transpаrancy is our only way forward. We dare to address and resolve issues head-on

  • We learn from our mistakes

    We deliver, take informed risks, and evolve to achieve our goals. We compare with the best version of ourselves

What is the role?

As 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.

Some of your daily tasks will include:

  • Define thermal architecture (radiators blankets heaters etc.)
  • Build thermal models
  • Compute thermal predictions for flight (hot case, cold case) and TVAC tests
    • Correlate models with test results
    • Identify test success criteria
    • Compute thermal power consumption
  • Investigation and closure of all issues related to thermal behavior

What do we look for?

  • Master of Science in aerospace engineering or mechanical/thermal engineering (or equivalent)
  • Excellent technical background in at least satellite Thermal engineering
  • Hands-on experience with spacecraft thermal analysis software such as Thermal Desktop, Comsol, ESATAN-TMS, or Systema/Thermica
  • Openness to knowledge sharing and willingness to mentor junior engineers
  • Understanding the importance of the last-mile delivery
  • Have excellent communication skills and a positive attitude

How to stand out?

  • 5+ years experience in Space programs engineering
  • Background in nano satellites and small satellites
  • Thorough understanding of of thermal systems
  • Experience with COMSOL Multiphysics, Siemens NX Space Systems Thermal, or SINDA/FLUINT
  • Hands-on experience with TVAC testing and thermal model correlation
  • Familiarity with ECSS thermal standards (e.g. ECSS-E-ST-31C)

Why EnduroSat?

  • Fast-paced and delivery-focused culture

    We work with well-defined quarterly based objectives, that allow us to fast track the progression of our work and improve as we go

  • Tough engineering challenges & hard-core R&D

    You will be able to work on unique space technology and build next-gen innovations, while mentored by world-recognized space experts

  • Constant learning and progression

    Own your personal growth by navigating through our career progression framework and educational programs

  • Chance to join our space educational program

    Meet international space experts and improve your knowledge and skillset with our hands-on educational program

    At 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. Additionally, this position is suitable for people with disabilities in accordance with the People with Disabilities National Regulation Act, ensuring accessibility and accommodation in the workplace.

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