Senior Staff Thermal Engineer - $15K Sign On Bonus
CesiumAstro
Westminster, CO · $184k–$246k a year · Posted October 8, 2026
Just laid off? Start here: a plan for the first weeks
See every open role at CesiumAstro
More in Colorado job market · Aerospace & Defense · Engineering jobs
More roles at CesiumAstro
- Staff Material Planner · Westminster, CO
- Senior Quality Assurance Engineer · Austin, TX
- Principal Electrical Engineer · Austin, TX
- Senior Electrical Engineer – Satellite C&DH Subsystem - $10K Sign On Bonus · Austin, TX
- Staff FPGA Operations Project Engineer · Austin, TX
- Staff FPGA Operations Project Engineer · El Segundo, CA
Similar jobs
- Staff Thermal Engineer - Space Payload Design, Analysis and Modeling · Infleqtion · Louisville, CO
- Thermal Systems Engineer, Product Development · AtmosZero · Loveland, CO
- Thermal Systems & Applications Engineer · AtmosZero · Loveland, CO
- Senior Thermal Engineer (Houston, TX) · Hewlett Packard Enterprise · Spring, TX
- Sr Principal Thermal Engineer · Hewlett Packard Enterprise · Sunnyvale, CA
- Staff Thermal Engineer · Qualcomm Inc/De · San Diego, CA
Where Westminster, CO ranks
Where Westminster, CO placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #2Best all-round cities for mid-career professionals in the Mountain West62 / 100 · of 11
- #3Best cities for pay after cost of living in the Mountain West$143k · of 11
- #5Cities with the most jobs that need no experience in the Mountain West1.6% · of 18
- #5Best cities for mid-career professionals in the Mountain West59% · of 19
- #6Best all-round cities for AI careers in the Mountain West48 / 100 · of 11
- #7Best cities for software and engineering jobs in the Mountain West137 openings · of 22
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
How AI is used in this kind of work
AI use among stationary engineers and boiler operators is little observed so far. Measured exposure for stationary engineers and boiler operators: 0% (little observed).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
Skills this job asks for
Say which you have and which you want to build. We use it to match you to jobs like this one.
About the job
Please Note: To conform with the United States Government Space Technology Export Regulations, the applicant must be a U.S. citizen, lawful permanent resident of the U.S., conditional resident, asylee or refugee (protected individuals as defined by 8 U.S.C. 1324b(a)(3)), or eligible to obtain the required authorizations from the U.S. Department of State.
At CesiumAstro, we are developers and pioneers of out-of-the-box communication systems for satellites, UAVs, launch vehicles, and other space and airborne platforms. We take pride in our dynamic and cross-functional work environment, which allows us to learn, develop, and engage across our organization. If you are looking for hands-on, interactive, and autonomous work, CesiumAstro is the place for you. We are actively seeking passionate, collaborative, energetic, and forward-thinking individuals to join our team.
We are offering a $15,000 Sign On Bonus for this position.
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.).
CesiumAstro considers several factors when extending an offer, including but not limited to, the role and associated responsibilities, a candidate’s work experience, education/training, and key skills. Full-time employment offers include company stock options and a generous benefits package including health, dental, vision, HSA, FSA, life, disability and retirement plans.
CesiumAstro is an Equal Opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected Veteran Status, or any other characteristic protected by applicable federal, state, or local law.
Please note: CesiumAstro does not accept unsolicited resumes from contract agencies or search firms. Any unsolicited resumes submitted to our website or to CesiumAstro team members will be considered property of CesiumAstro, and we will not be obligated to pay any referral fees.