Now Hiring - Flex - Presales Engineer - Liquid Cooling in Littleton, MA

Full description of the position

Job Posting Start Date 06-03-2026 Job Posting End Date 08-31-2026 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

JetCool, a Flex Company, delivers patented directtochip liquid cooling solutions purposebuilt for AI and highdensity compute environments. Powered by JetCool's proprietary microconvective cooling technology and fullstack portfoliofrom SmartPlates to Coolant Distribution Units (CDUs)we enable leading processor and system designers to push performance, efficiency, and reliability to new limits. The Pre-Sales Engineer based in either Littleton, MA, Austin, TX or Milpitas, CA serves as a technical advisor to customers requiring liquid cooled Cold Plates (SmartPlates) and Cooling Distribution Units (CDU), bridging thermal and mechanical engineering depth with clear, confident customer communication. This role owns presales technical engagement ensuring JetCool solutions meet customer thermal performance and AI System and Rack integration needs. Success in this role requires the ability to communicate complex fluiddynamics and heattransfer Engineering analysis into concise, customerready explanations, while adapting technical depth in real time based on audience and context. What a Typical Day Looks Like:

• Lead technical discovery conversations to understand customer thermal requirements for AI Systems
• Serve as the primary technical interface in customer engagements
• Support sales engagements including RFP/RFQ responses and drafting content.
• Gather the customer requirements and technical documents for Engineering to develop the liquid cooling solution
• Partner with Engineering in understanding and communicating the liquid cooling solution
• Evaluate AI systemlevel integration across cold plates, manifolds, CDUs, and racklevel cooling solutions
• Develop and deliver technical presentations highlighting JetCool's technologies' differentiation
• Present thermal technical analyses in a clear, customerconsumable format for both engineers and procurement managers
• Read the room and adjust technical depth, pacing, and messaging based on audience feedback The Experience We're Looking to Add to Our Team:
• B.S. Mechanical Engineering
• Foundation in fluid mechanics or heat transfer (experience with both preferred)
• 3+ years of industry experience, including pre-sales, engineering, or customer facing technical roles
• Experience working with fluid based mechanical designs
• Strong communication and presentation skills
• Exposure to CFD analysis tools (e.g., ANSYS, Icepak, FloTHERM) is preferred but not required
• Apply fundamentals of fluid mechanics and heat transfer to help JetCool Engineering develop liquid cooling solutions to meet customer requirements is preferred 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

Pay Range

(Applicable to Massachusetts) $110,100.00 USD - $151,400.00 USD Annual Job Category Design, Process & Technology Engineering Relocation: Eligible for domestic relocation only Is Sponsorship Available? Yes JetCool 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're happy to provide reasonable accommodations to those with a disability for assistance in the application process. Please email [please apply online] and we'll discuss your specific situation and next steps (NOTE: this email does not accept or consider resumes or applications. This is only for disability assistance. To be considered for a position at JetCool, you must complete the application process first).