Mechanical Engineer

Flex•Littleton, MA

32d

About The Position

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. United by a shared purpose, our teams are pushing the limits of what’s possible and tackling complex challenges. 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. Job Summary To support our extraordinary teams who build great products and contribute to our growth, we’re looking to add a Mechanical Engineer located in Littleton, MA. Reporting to the Product Manager, the Mechanical Engineer will play a key role in our product development team. This engineer will contribute to the design, analysis, and validation of advanced liquid cooling systems for processors, servers, and rack-level infrastructure.

Requirements

Bachelor’s degree in mechanical engineering or related field (master’s preferred).
6–10 years of mechanical engineering experience, ideally in thermal management, electronics cooling, or complex hardware systems.
Hands-on experience designing components for liquid cooling systems, such as cold plates, heat exchangers, or fluid distribution systems.
Familiarity with datacenter thermal challenges, particularly cooling processors, GPUs, and dense computer hardware.
Proficiency in CAD tools (e.g., SolidWorks, Creo) and simulation tools (structural and thermal/CFD).
Strong understanding of materials, machining, brazing, casting, plastics, and sealing technologies.
Experience working through prototype, validation, and production release phases of hardware development.
Excellent problem-solving skills and the ability to work on cross-functional engineering teams.

Nice To Haves

Experience with rack-level and row-level cooling strategies (air and/or liquid).
Knowledge of ASHRAE thermal guidelines or hyperscale datacenter requirements.
Experience with reliability testing, environmental testing, and root-cause analysis.
Exposure to modular datacenter environments or scalable cooling architectures.

Responsibilities

Contribute to design and development of liquid cooling components and assemblies, including cold plates, manifolds, tubing, mounting hardware, and heat exchangers.
Perform mechanical and thermal analysis, including structural modeling, tolerance analysis, and CFD-assisted design input.
Support prototype builds, functional testing, and iterative design refinement.
Collaborate closely with electrical, thermal, and fluid systems engineers to optimize cooling performance at the processor, server, and rack levels.
Apply Design for Manufacturing (DFM) and Design for Assembly (DFA) these are best practices to ensure scalable, high‑quality production.
Work with suppliers, manufacturing teams, and operations to transition designs from prototype to volume manufacturing.
Create engineering documentation, including drawings, models, BOMs, and specification packages.
Participate in design reviews and provide technical input to ensure robust, reliable solutions for demanding datacenter environments.
Stay informed on emerging cooling technologies, industry standards, and datacenter trends.