Flex Ltd.

Sr. Mechanical Development Engineer

USA, MA, Littleton · Senior

Sponsorship not specifiedDetected 29 days ago

AccessibilitySolidWorksCreoGD&TMechanical DesignCommunicationCollaboration

About the role

Reporting to the Product Manager the Mechanical Development engineer The Sr.
They will work closely with Thermal, Electrical, Product Development, Manufacturing, and Quality teams to take products from concept through launch and into scalable production.
Select materials and finishes to address corrosion, galvanic compatibility, cleanliness, pressure containment, and long-term durability in liquid cooling environments.

At JetCool, a Flex company, we're at the forefront of liquid cooling innovation, delivering advanced solutions that empower our partners in AI and high-performance computing.
A career at JetCool offers the opportunity to make a real impact by helping build smarter, more sustainable data centers.
Together, we're not just advancing technology - we're redefining cooling standards to create a more sustainable tomorrow.
Mechanical Design Engineer will own the design, analysis, validation, and refinement of mechanical components and assemblies that enable reliable, high efficiency liquid cooling.
Mechanical Design & Development
Own mechanical design for liquid cooling components including cold plates, manifolds, quick-disconnects, tubing assemblies, housings, and chassis interfaces.
Create and manage detailed CAD models, 2D drawings, GD&T, and tolerance stack-ups to ensure robust, manufacturable designs.
Drive sealing strategies using O-rings, gaskets, welds, brazes, and adhesives matched to coolant chemistry and operating conditions.
Collaborate with thermal engineers to optimize mechanical features influencing flow distribution, pressure drop, fin/channel geometry, and heat transfer efficiency.
Conduct DFM reviews with suppliers to align machining, brazing, and fabrication methods with design requirements.

Job Posting Start Date 06-22-2026 Job Posting End Date 09-25-2026 The base pay range for this position is provided below.
$105,000.00 USD - $144,400.00 USD Annual

BS/MS in Mechanical Engineering or equivalent experience.
7+ years developing complex mechanical components or assemblies for electro mechanical systems; experience with liquid cooling or fluid systems strongly preferred.
Strong proficiency with CAD (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 testing.
Familiarity with materials (copper, aluminum, stainless steel, polymers, elastomers) and their behavior in liquid coolant environments.
Strong fundamental technical expertise in mechanical design and structural evaluation.
Strong working knowledge of fluid dynamics and heat transfer principles.
Excellent communication skills and ability to lead technical decisions across teams.
To support our extraordinary teams who build great products and contribute to our growth, we're looking to add a Mechanical Development engineer located in Littleton, MA.

Equal Opportunity Employer and employment selection decisions are based on merit, qualifications, and abilities.

This listing is sourced directly from Flex Ltd.'s careers page and normalized into a canonical job model.