Manifold Engineer- Thermal & Fluid Systems

Overview

Flex is the diversified manufacturing partner of choice that helps market-leading brands design, build and deliver innovative products that improve the world. A career at Flex offers the opportunity to make a difference and invest in your growth in a respectful, inclusive, and collaborative environment. If you are excited about a role but don't meet every bullet point, we encourage you to apply and join us to create the extraordinary.

As a Manifold Engineer in Littleton, MA
, you will be responsible for designing and optimizing the fluid architecture that enables efficient and reliable cooling across our product portfolio. You’ll work closely with thermal, mechanical, and manufacturing teams to develop manifolds that meet performance, scalability, and manufacturability requirements.

• Design and develop fluid distribution manifolds for liquid cooling systems used in processors, servers, racks, and datacenter deployments.
• Perform CFD simulations and thermal-fluid modeling to optimize flow uniformity, pressure drop, and thermal performance.
• Select materials and components suitable for high-reliability, corrosion-resistant, and leak-proof operation.
• Integrate and specify quick disconnects, fluid seals, and other connectors for modularity, serviceability, and long-term reliability.
• Collaborate with mechanical and manufacturing engineers to ensure designs are scalable and cost-effective.
• Support prototype builds and testing, iterating designs based on performance data and feedback.
• Create and maintain detailed technical documentation, including CAD models, drawings, BOMs, and specifications.
• Work with suppliers and contract manufacturers to validate production processes and quality standards.
• Stay informed on emerging technologies in fluid distribution, sealing systems, and datacenter cooling infrastructure.

• Bachelor’s or Master’s degree in Mechanical Engineering, Thermal Engineering, or a related field.
• 3+ years of experience in fluid system design, preferably in electronics cooling or industrial thermal systems.
• Proficiency in CAD tools (e.g., Solid Works, Creo) and CFD software (e.g., ANSYS Fluent, COMSOL).
• Strong understanding of fluid dynamics, heat transfer, and thermodynamics.
• Familiarity with quick disconnects, fluid seals (e.g., O-rings, gaskets, compression fittings), cold plates, pumps, and other liquid cooling components.
• Knowledge of manufacturing processes such as CNC machining, injection molding, and brazing.
• Excellent problem-solving skills and ability to thrive in a fast-paced, iterative development environment.
• Experience designing for high-density server environments or rack-scale cooling systems is a plus.
• Experience in a startup or early-stage product development environment is a plus.
• Knowledge of ASHRAE thermal guidelines, datacenter standards, and sustainability practices is a plus.

Flex is an Equal Opportunity Employer and employment selection decisions are based on merit, qualifications, and abilities. We do not discriminate based on: age, race, religion, color, sex, national origin, marital status, sexual orientation, gender identity, veteran status, disability, pregnancy status, or any other status protected by law. We  happy to provide reasonable accommodations to those with a disability for assistance in the application process.

Please email  and we  discuss your specific situation and next steps (

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