Flex · 2 days ago
Sr. Mechanical Engineer
USA, MA, Littleton
Full-time
Onsite
Senior Level
$104K/yr - $143K/yr
6+ years expJetCool, a Flex company, is at the forefront of liquid cooling innovation, delivering advanced solutions for AI and high-performance computing. The Senior Mechanical Engineer will contribute to the design, analysis, and validation of advanced liquid cooling systems for processors, servers, and rack-level infrastructure.
ElectronicsManufacturingProduct Design
No H1B
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
Qualification
Required
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
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
Benefits
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
Company
Flex
Flex designs, manufactures, and supplies electronics products for the industrial sector.
10001+ employees
Funding
Current Stage
Public CompanyTotal Funding
$200MKey Investors
CienaSilver Lake
2023-11-29Post Ipo Equity
2003-03-03Post Ipo Equity· $200M
1994-03-25IPO
Leadership Team
Revathi Advaithi
Chief Executive Officer
Kevin Krumm
Chief Financial Officer
Recent News
2026-01-12
2026-01-05
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