Jetcool
AI and high-performance computing
PrincipalThermalMechanicalEngineer
Neural analysis suggests this role is
optimal for Principal candidates.
“Principal Thermal Mechanical Engineer at Jetcool. Skills: Thermal Mechanical Engineering, fluid dynamics, thermodynamics, heat transfer, mechanical design, fluid systems, liquid cooling, data center thermal management. Lead the architecture, design, analysis, and optimization of complex fluid and thermal systems—including pumps, fluids, tubing, heat exchangers, and associated components—for advanced computing and processing platforms. Own mechanical and fluid system deliverables from concept thr”
What You'll Achieve.
delivering advanced solutions that empower our partners in AI and high-performance computing; helping build smarter, more sustainable data centers; creating a more sustainable tomorrow; allowing higher coolant temperatures; driving more complete heat capture for liquid cooling; ensuring designs meet performance, reliability, manufacturability, and compliance requirements; raising overall team capability
Industry & Context.
analytical and problem solving capabilities; demonstrated ability to troubleshoot and optimize complex fluid systems across development and production phases; Support the resolution of complex technical issues throughout the product lifecycle
What They're Looking For.
Must Have
Minimum of 7+ years of experience designing and engineering fluid systems in data center thermal management and cooling, automotive, medical, or nuclear industries, at least 3+ years of direct experience with Coolant Distribution Units (CDUs), Deep expertise in fluid dynamics, thermodynamics, and heat transfer, with application of first principles engineering, Proven track record of new product development in thermal or fluid systems, including concept development, performance analysis, validation testing, and experimental design, analytical and problem solving capabilities, with demonstrated ability to troubleshoot and optimize complex fluid systems across development and production phases, Demonstrated technical leadership within a structured product development environment, with clear ownership of mechanical design deliverables from concept through release, Experience leading and mentoring development teams, driving technical direction, coordinating cross functional efforts, and ensuring alignment to product requirements and schedules, Accountability for product level mechanical execution, including leading design reviews, resolving technical risks, and ensuring designs meet performance, reliability, manufacturability, and compliance requirements, communication and technical documentation skills, with the ability to clearly communicate complex concepts to technical teams and senior stakeholders
What You'll Do.
Lead the architecture
and optimization of complex fluid and thermal systems—including pumps
and associated components—for advanced computing and processing platforms
Own mechanical and fluid system deliverables from concept through production
ensuring designs meet performance
and compliance requirements
Serve as a technical partner to customers and external collaborators
supporting system‑level integration of fluid solutions into broader product architectures
and test efforts to validate fluid flow
and material compatibility across operating conditions
and approve engineering requirements
and technical documentation in accordance with applicable industry standards and regulatory expectations
Lead and influence design reviews
presenting technical tradeoffs
and recommendations to cross‑functional teams
and senior stakeholders
Identify technical gaps and emerging challenges
advocate for targeted research and development
and lead exploratory efforts that build foundational knowledge and intellectual property
Establish and promote best practices in fluid system design
contributing to a engineering culture and continuous improvement
Provide technical leadership
and guidance to engineers across experience levels
supporting professional development and raising overall team capability
Contribute to new product innovation by evaluating emerging technologies
and alternative architectures to drive differentiated fluid system solutions
Support the resolution of complex technical issues throughout the product lifecycle
including development
and field support as needed
How You'll Work.
Team & Collaboration
Serve as a technical partner to customers and external collaborators; supporting system‑level integration of fluid solutions into broader product architectures; Lead and influence design reviews, presenting technical tradeoffs, risks, and recommendations to cross‑functional teams, customers, and senior stakeholders; Experience leading and mentoring development teams, driving technical direction, coordinating cross functional efforts, and ensuring alignment to product requirements and schedules
Communication Scope
communicating the art of the possible with JetCool technology; building a customer relationship on a technical level; communication and technical documentation skills; ability to clearly communicate complex concepts to technical teams and senior stakeholders
Process & Methodology
Own mechanical and fluid system deliverables from concept through production, Accountability for product level mechanical execution
Full Job Description
Job Posting Start Date 05-06-2026 Job Posting End Date 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 **Principal Thermal Mechanical Engineer** located in**Littleton, MA.** Reporting to the**Mechanical Development Associate Principal Engineer** the **Principal Thermal Mechanical Engineer** will play a pivotal role in the early phases of product development and serving in a guidance capacity through product maturation. Our products drive sustainability across the data center infrastructure by allowing higher coolant temperatures and by driving more complete heat capture for liquid cooling. The Principal Mechanical Engineer will provide technical leadership, mentorship, and hands-on expertise in mechanical design, fluid dynamics, and heat transfer but also work closely with customers in communicating the art of the possible with JetCool technology and building a strong customer relationship on a technical level. **What a typical day looks like:** * Lead the architecture, design, analysis, and optimization of complex fluid and thermal systems—including pumps, fluids, tubing, heat exchangers, and associated components—for advanced computing and processing platforms. * Own mechanical and fluid system deliverables from concept through production, ensuring designs meet performance, reliability, manufacturability, and compliance requirements. * Serve as a technical partner
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