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Salary
$184k – $225k per year
Location
In office (Westminster)
Seniority
Staff · 12+ years exp
Visa
H-1B filings in 12 months: 2
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 19, 2026. First seen by Alion on Oct 8, 2026. CesiumAstro scores A on the Alion truth index.

Overview
Company
Impact
Profile match
CesiumAstro is an American company founded in Austin in 2017 that builds active phased array communications payloads for satellites, aircraft and defence platforms. Its systems are software-defined and electronically steered, which lets a moving platform track several links at once without mechanical antennas, and the company manufactures them in house rather than integrating third-party subsystems. It sells mainly to defence customers and satellite operators, has raised venture funding from investors including Airbus Ventures and Lightspeed, and operates facilities in Austin, Colorado and the United Kingdom.

We are looking to add a Senior Staff Thermal Engineer to our team. If you enjoy working in a startup environment and are passionate about developing leading-edge hardware for satellites, spacecraft, and aerospace systems, we would like to hear from you.

In this position, you will be responsible for the design, analysis, and validation of thermal control systems for CesiumAstro’s next-generation products. The ideal candidate will combine extensive experience in developing and analyzing thermal management systems for spacecraft, satellite electronics, and airborne systems with deep knowledge in space and aerospace thermal environments.

As a senior member of a cross-functional team, you will be responsible for thermal designs from initial concept design through requirements definition, detailed design, simulation/analysis, manufacturing, testing, qualification of CesiumAstro's products. You will work closely with other electrical and mechanical engineers on an integrated team to develop highly optimized solutions.

The successful candidate will also present engineering design review materials to customers and upper management, as well as participate in proposal-writing efforts. As such, excellent written and verbal communication skills are required.

JOB REQUIREMENTS AND MINIMUM QUALIFICATIONS

  • A Bachelor of Science (BS) or higher in Mechanical, Thermal, or Aerospace Engineering from an accredited university or institution.
  • 12 years of industry experience in thermal/mechanical design and analysis utilizing a mixture of numerical and analytical techniques. A Master of Science may count as 2 years of experience.
  • Expertise in electronics/PCBA, box, and system-level thermal design and analysis.
  • Strong proficiency in professional simulation tools such as ANSYS (preferred) or Thermal Desktop, as well as MCAD tools such as SolidWorks (preferred).
  • Strong mechanical engineering and heat transfer foundation.
  • Experience designing and analyzing radiative, conductive and convective heat transfer for various applications.
  • Experience building thermal resistance networks and reduced order thermal models for complex thermal systems.
  • Experience correlating thermal models with thermal chamber or TVAC test results.
  • Experience developing analysis automation tools (spreadsheet or script-based).
  • Familiarity with common manufacturing processes for thermal control systems.
  • Familiarity with the development of thermal control systems and fixtures for lab environments.

PREFERRED EXPERIENCE

  • Expertise in thermal management of phased array and/or high-power RF electronics.
  • Experience in thermal analysis of electronics at the die, lead-frame, and package level.
  • Proficiency with computational scripting languages (Matlab, Python, Mathematica, etc.).
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