Senior Mechanical Development Engineer

Flex (Flextronics)

Confirmed live yesterday High trust

Quick summary

Work type
On-site
Location
Littleton, MA
Salary
$105,000–$144,400 / yr
Posted
46 days ago
Freshness
Confirmed live yesterday
Closes
Oct 30, 2026

Market check

Salary context

Below market

How this pay compares to similar roles

Similar $172k
This role $125k
$94k most similar roles pay here $208k

This role pays less than 89% of similar roles. Most pay $146,500–$197,000 — the shaded band above. At the midpoint, this role pays about $125k versus about $172k 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 29 open roles on FindRole.

Listed pay typically runs $118,300–$162,600 across 15 roles with salary data.

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View all roles at Flex (Flextronics)

At a glance

TL;DR · Senior Mechanical Development Engineer

The Sr. Mechanical Development Engineer joins the product development team to own the design, analysis, validation, and refinement of mechanical components for high-efficiency liquid cooling systems. This role involves designing critical components such as cold plates, manifolds, quick-disconnects, and chassis interfaces while managing CAD models, 2D drawings, GD&T, and tolerance stack-ups. The engineer performs simulations for stress, thermal expansion, and fluid dynamics to optimize heat transfer and flow distribution. Key responsibilities include selecting materials like copper and aluminum, developing sealing strategies, conducting DFM reviews with suppliers, and leading root cause analysis for failures. Candidates must be proficient in SolidWorks, Creo, or NX and possess expertise in precision machining, brazing, plating, and pressure testing. The role addresses the technical challenge of ensuring reliable, durable liquid cooling infrastructure within high-performance computing environments.

What you'll do

  • Design mechanical components including cold plates, manifolds, quick-disconnects, tubing assemblies, and chassis interfaces.
  • Create detailed CAD models, 2D drawings, GD&T, and tolerance stack-ups for manufacturable designs.
  • Select materials and finishes to ensure corrosion resistance, pressure containment, and durability in liquid cooling environments.
  • Perform engineering simulations for mechanical stress, thermal expansion, fatigue, vibration, and fluid flow/pressure.
  • Develop and execute validation plans for pressure testing, leak testing, burst testing, and environmental exposure.
  • Lead root cause analysis for component failures and implement corrective design changes.
  • Collaborate with suppliers to define manufacturing processes, tooling requirements, and critical-to-quality characteristics.
  • Translate product requirements into mechanical specifications while ensuring integration with thermal and electrical systems.

What we're looking for

  • BS/MS in Mechanical Engineering or equivalent experience.
  • 7+ years of experience developing complex mechanical components or assemblies for electromechanical systems.
  • Experience with liquid cooling or fluid systems is strongly preferred.
  • Proficiency in CAD software (SolidWorks, Creo, NX), drawing generation, and GD&T (ASME Y14.5).
  • Experience designing for precision machining, brazing, plating, elastomer sealing, and pressure-rated components.
  • Hands-on experience with pressure/leak testing, dimensional inspection, materials evaluation, and mechanical validation.
  • Knowledge of material behavior in liquid coolant environments and principles of fluid dynamics and heat transfer.
  • Strong communication skills and ability to lead technical decisions across cross-functional teams.

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