Hiring: Thermal Engineer (Mid) Company: Apex Location: Los Angeles, CA Job Posted Time: 2026-09-10 11:29:57 Employment Type: Full-time Target Skills & Keywords : Apex, C, C++, MATLAB, Python, Siemens NX About the job Experience: •3+ years of experience in radiative and conductive thermal modeling of spacecraft systems using Thermal Desktop or similar software. •1+ year of experience with thermal cycling and thermal vacuum testing, including setup, instrumentation, and model correlation. Required Skills: •Develop and maintain spacecraft-level thermal models using Ansys Thermal Desktop and other analytical tools. •Partner cross-functionally with subsystem engineers to design and optimize thermal control systems for avionics and electro-mechanical components. •Evaluate the validity of thermal analysis results and ensure compliance with Mil-Standard, Aerospace TOR, and vendor requirements. •Plan, execute, and manage thermal testing campaigns, including thermal vacuum (TVAC) and thermal cycling tests. •Interface directly with mechanical teams to develop passive and active thermal management hardware, including radiators, heaters, heat pipes, and coatings. •Support thermal subsystem milestone reviews (SRR, PDR, CDR, MRR). •Perform thermal model correlation using flight and test data. •Oversee thermal flight hardware integration and quality control. Qualifications: •In-depth knowledge of thermal margin definitions and aerospace thermal control standards. •Operational familiarity with 2-phase spacecraft thermal control systems. •Knowledge of PCBA thermal modeling and thermal interface materials. •Proficiency in Python, C/C++, or Matlab for thermal modeling and automation. •Understanding of SMC-S016 standards or equivalent. •Operational familiarity with Atlassian software tools and engineering workflows •Apex believes in creating a work environment that you look forward to embracing every day. Our employees love working at Apex, and we want you to love it too. We're a fast-growing startup that has raised more than $500M in funding, and we invest heavily in our people from day one. •Shared upside: Receive equity in Apex, letting you benefit from the work you create Compensation: •$125,000 - $155,000 / year Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!