Sr. Thermal Systems Engineer

Flex (Flextronics)

Quick summary

Work type
On-site
Location
Littleton, MA
Salary
$126,500–$173,900 / yr
Posted
6 days ago

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Salary context

Competitive pay

How this pay compares to similar roles

Similar $162k
This role $150k
$118k most similar roles pay here $202k

This role pays less than 62% of similar roles. Most pay $131,936–$193,000 — the shaded band above. At the midpoint, this role pays about $150k versus about $162k for comparable roles.

Based on 240 similar postings.

Employer

About Flex (Flextronics)

Flex (formerly Flextronics) is a global technology, supply chain, and manufacturing solutions provider helping companies design, build, and deliver products across industries. Industry: Electronics Manufacturing Services

Flex (Flextronics) currently has 17 open roles on FindRole.

Listed pay typically runs $126,500–$173,900 across 9 roles with salary data.

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View all roles at Flex (Flextronics)

At a glance

TL;DR · Sr. Thermal Systems Engineer

The Senior Thermal Systems Engineer role at our company in Littleton, MA involves leading the end-to-end architecture and validation of direct-to-chip cooling systems for high-TDP CPUs/GPUs/accelerators. This technical leader will collaborate with Product Management, Mechanical/Electrical Engineering, Manufacturing, Quality, Reliability, and customers to ensure robust, scalable products that meet performance, reliability, and cost targets. Responsibilities include defining thermal requirements, building 1D/3D models using tools like FloEFD and ANSYS Fluent, designing liquid cooling subsystems, validating systems through lab and rack-scale testing, and engaging with product management on roadmaps and business cases. The ideal candidate has a BS/MS in Mechanical or Aerospace Engineering, 5+ years of experience in thermal design/validation for high-power electronics, expertise in CFD and thermal metrology, hands-on experience with lab instrumentation and test automation tools like Python and LabVIEW, and the ability to bring products from EVT through PVT.

What you'll do

  • Define system-level thermal requirements for high-TDP CPUs/GPUs/accelerators.
  • Build and validate 1D/3D models of liquid cooling subsystems using CFD software.
  • Specify and refine cold plates, CDUs, manifolds, hoses/QDs, reservoirs, filters, sensors, and controls.
  • Develop test plans for thermal performance, pressure integrity, leak detection, and long-term reliability.
  • Execute lab and rack-scale testing to validate thermal systems and drive corrective actions.

What we're looking for

  • BS/MS in Mechanical Engineering or Aerospace Engineering with 5+ years of thermal design/validation experience for high-power electronics.
  • Proven expertise in liquid cooling systems, including CFD modeling and pressure drop analysis.
  • Hands-on experience with lab instrumentation and test automation tools (Python, LabVIEW).
  • Ability to lead product validation from EVT through PVT stages, ensuring DFX principles are applied.
  • Strong technical communication skills for documentation and collaboration across departments.
  • Experience in defining thermal requirements and conducting sensitivity trade-offs for cooling systems.

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