Thermal Engineer

As a Thermal Engineer, you will own the thermal design of Array's radar satellites and payloads, from architecture through flight verification. Spaceborne radar is fundamentally a thermal problem: high-power transmit amplifiers operate at high duty cycles in a small-satellite package, with tight temperature stability requirements driven by RF performance. You will own the in-house thermal simulation framework, extending its physics, validating it against test data, and using it to drive design decisions, while building, instrumenting, and testing flight hardware. You will define heat rejection architectures, design radiators and conduction paths, and run thermal vacuum campaigns, working closely with RF, electrical, mechanical, and systems engineers to make sure the hardware survives and performs on orbit.

Responsibilities

Define spacecraft and payload thermal architecture, including radiator sizing and conduction paths from high-power RF components to space; Own, extend, and validate Array's in-house Python thermal simulation framework, and use it to drive design decisions; Support board- and component-level thermal design with electrical and RF engineers, including junction temperature and derating analysis; Design, build, and test thermal hardware: radiators, interface materials, coatings, MLI, heaters, and sensor instrumentation; Plan and execute thermal vacuum and thermal balance test campaigns, and correlate models against test and flight telemetry; Develop thermal requirements, interface control documentation, and verification plans with systems engineering

Requirements

Bachelor's degree in Mechanical or Aerospace Engineering, Physics, or a related STEM field; 3+ years of industry experience fielding hardware in thermally-constrained products; Strong coding proficiency, preferably in Python, with experience extending or developing engineering analysis tools rather than only using them; Hands-on experience building, instrumenting, and testing thermal hardware; Strong grounding in heat transfer fundamentals; Excellent teamwork and communication skills; Ability to work in a fast-paced, iterative design environment

Nice to have

Master's or Ph.D. in a related discipline; Experience with satellite thermal design and flight-proven hardware; Experience developing thermal or multiphysics simulation software: numerical methods, radiation view factors, transient solvers; Familiarity with software engineering practices: version control, testing, code review; Experience with thermal management of high-power RF electronics (GaN power amplifiers, phased arrays, high-dissipation boards); Familiarity with two-phase systems: heat pipes, loop heat pipes, or vapor chambers; Experience with commercial thermal tools (Thermal Desktop, SINDA/FLUINT, ANSYS) as a complement to in-house tooling

Benefits

Competitive salaries and meaningful equity; Medical, dental, and vision insurance (including a fully employer-paid medical plan); Paid parental leave (12 weeks / 6 weeks); 19 paid vacation days, 10 sick days, 11 company holidays; 401(k) with employer match (100% match up to 3%, 50% match up to 5%); Commuter expenses (parking & transit); Daily lunch stipend; Audible subscription; Claude Pro access; relocation support; Hybrid work options & flexibility