Flex

Manifold Engineer- Thermal & Fluid Systems

Flex$82K — $113K *
Aerospace & Defense
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • Bachelor's or Master's in Mechanical Engineering, Thermal Engineering, or related field.
  • 3+ years in fluid system design, focusing on electronics cooling or industrial thermal systems.
  • Proficient in CAD tools (SolidWorks, Creo) and CFD software (ANSYS Fluent, COMSOL).
  • Strong knowledge of fluid dynamics, heat transfer, and thermodynamics principles.
  • Familiarity with quick disconnects, fluid seals, cold plates, and pumps relevant to liquid cooling.
  • Understanding of manufacturing processes, including CNC machining and injection molding.
  • Experience in high-density server environments or rack-scale cooling is a plus.

Responsibilities

  • Design fluid distribution manifolds for liquid cooling in processors and servers.
  • Conduct CFD simulations to optimize flow and thermal performance.
  • Select materials for high-reliability, corrosion-resistant operations.
  • Integrate quick disconnects and fluid seals for modularity and reliability.
  • Collaborate with teams to ensure designs are scalable and cost-effective.
  • Support prototype builds and iterate designs based on testing data.
  • Create and maintain technical documentation including CAD models and specifications.

Benefits

  • Full range of medical, dental, and vision plans.
  • Life Insurance coverage.
  • Short-term and Long-term Disability support.
  • Matching 401(k) Contributions.
  • Vacation and Paid Sick Time.
  • Tuition Reimbursement for further education.
Full Job Description
Job Summary

To support our extraordinary teams who build great products and contribute to our growth, we're looking to add a Manifold engineer located in Littleton, MA.

As a Manifold Engineer 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.

What a typical day looks like:
  • 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.

The experience we are looking to add to our team:
  • 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., SolidWorks, 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.
  • Experience designing for high-density server environments or rack-scale cooling systems is a plus.


BO18

What you'll receive for the great work you provide:
  • Full range of medical, dental, and vision plans
  • Life Insurance
  • Short-term and Long-term Disability
  • Matching 401(k) Contributions
  • Vacation and Paid Sick Time
  • Tuition Reimbursement


Application Deadline:

Applications for this job position will be accepted for at least five days following the job posting start date below and continuing until the end date below or until the position is filled. This posting may close sooner due to application volume.
Job Posting Start Date 06-22-2026 Job Posting End Date 09-25-2026
The base pay range for this position is provided below. The final base rate offered will be determined using job-related, non-discriminatory criteria, including but not limited to experience, qualifications, geographic location, education, external market data, and internal equity.
$82,200.00 USD - $113,000.00 USD Annual

Job Category
Design, Process & Technology Engineering

Is Sponsorship Available?
No

About Flex

Flex Ltd. is an American Singaporean-domiciled multinational electronics contract manufacturer. It is the third largest global electronics manufacturing services (EMS), original design manufacturer (ODM) company by revenue, behind only Pegatron for what concerns original equipment manufacturers. Flex has manufacturing operations in over 30 countries, totaling approximately 200,000 employees.
Learn more about Flex
Size
172,648 employees
Market Cap
$9.7 billion
Industry
Net Income
$421 million
Founded
2016
5 Year Trend
+1.8%
Revenue
$23.3 billion
NASDAQ

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