JETCOOL Technologies
Sr. Thermal Systems Engineer
USA, MA, Littleton · Senior
Sponsorship not specifiedDetected 29 days ago
PythonAccessibilityPRDsANSYSCFDSystems EngineeringMechanical DesignAerospace EngineeringElectrical EngineeringPower ElectronicsLabVIEWCOMSOLTest AutomationCommunicationThermodynamics
About the role
- Specify and refine cold plates, CDUs, manifolds, hoses/QDs, reservoirs, filters, sensors, and controls.
- Execute lab and rack-scale testing (pump curves, flow balance, ΔP mapping, heat load emulation, transient behavior).
- Work with Product Management on PRDs, roadmaps, and business cases.
Responsibilities
- 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.
- 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.
- Reporting to the Product Manager the Senior Thermal Systems Engineer will own the end-to-end architecture, analysis, validation, and deployment of direct-to-chip (D2C) cooling systems used to cool high-TDP CPUs/GPUs/accelerators.
- define requirements, run pilots, analyze fleet telemetry, and support deployment at scale.
- Own thermal architecture & modeling
- Apply first principles in fluid dynamics and heat transfer to analyze design concept thermal performance
- Build and validate 1D/3D models (e.g., FloEFD, Icepak, MacroFlow, ANSYS Fluent, COMSOL) for cold plates, manifolds, quick-disconnects (QDs), pumps, and CDUs.
- Design liquid cooling subsystems
- Collaborate with ME/EE on mechanical stack-up, materials, corrosion mitigation (galvanic compatibility), and leak risk reduction.
Nice to have
- BS/MS in Mechanical Engineering or Aerospace Engineering or related field (PhD a plus).
Compensation
- Job Posting Start Date 06-22-2026 Job Posting End Date The base pay range for this position is provided below.
- $126,500.00 USD - $173,900.00 USD Annual
Benefits
- Full range of medical, dental, and vision plans
- Life Insurance
- Short-term and Long-term Disability
- Vacation and Paid Sick Time
- Tuition Reimbursement
Company info
- 5+ years experience in thermal design/validation for high-power electronics (preferably data center/server/HPC).
- Excellent first principles knowledge in fluid dynamics, thermodynamics, and heat transfer
- Proven expertise in liquid cooling, including CFD, pressure drop/flow modeling, and thermal metrology.
- Hands-on with lab instrumentation (flow meters, pressure transducers, thermocouples/RTDs, DAQ, leak detectors) and test automation (Python, LabVIEW, or similar).
- Experience bringing products from EVT → DVT → PVT → ramp, including DFX and supplier engagement.
- Excellent technical communication and documentation skills.
- To support our extraordinary teams who build great products and contribute to our growth, we're looking to add a Senior Thermal Systems Engineer located in Littleton, MA.
- They will be the technical leader partnering with Product Management, Mechanical/Electrical Engineering, Manufacturing, Quality, Reliability, and key customers to deliver robust, scalable products that meet performance, reliability, and cost targets.
Equal opportunity
- Equal Opportunity Employer and employment selection decisions are based on merit, qualifications, and abilities.
Visa & Work Authorization
- Is Sponsorship Available?
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