Sr. Thermal Systems Engineer

About the role

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.

Responsibilities

• Own thermal architecture & modeling
• Define system-level thermal requirements (TDP range, ΔT, coolant temperature, flow rate, pressure drop, acoustic & power budgets)
• 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
• Perform sensitivity trade-offs (flow distribution, fin geometry, microchannel optimization, TIM selection, manifold topology)
• Design liquid cooling subsystems
• Specify and refine cold plates, CDUs, manifolds, hoses/QDs, reservoirs, filters, sensors, and controls
• Collaborate with ME/EE on mechanical stack-up, materials, corrosion mitigation (galvanic compatibility), and leak risk reduction
• Define DFX (DFM/DFA/DFT) and lead EVT/DVT/PVT from prototypes to mass production
• Validate and qualify
• Develop test plans for thermal performance, pressure integrity, leak detection, long-term reliability (HALT/HASS), and contamination control (particulates, biogrowth)
• Execute lab and rack-scale testing (pump curves, flow balance, ΔP mapping, heat load emulation, transient behavior)
• Drive failure analysis and corrective actions (FMEAs, 8D/PPS)
• Partner across the business
• Work with Product Management on PRDs, roadmaps, and business cases
• Support manufacturing process development (leak/pressure test stations, purge and fill, cleanliness criteria) and supplier selection/qualification
• Engage with customers: define requirements, run pilots, analyze fleet telemetry, and support deployment at scale

Requirements

• BS/MS in Mechanical Engineering or Aerospace Engineering or related field (PhD a plus)
• 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

Qualifications

Preferred qualifications include:

• Experience with advanced thermal management techniques
• Knowledge of industry-standard thermal measurement tools and techniques
• Experience with thermal simulation software (e.g., Ansys Fluent, COMSOL)
• Experience with thermal testing and validation processes

Skills

• Thermal design and analysis
• Fluid dynamics and heat transfer
• Thermal metrology and testing
• Collaborative problem-solving
• Technical writing and documentation

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

Pay

$126,500.00 USD - $173,900.00 USD Annual

Schedule

Full-time

JetCool is an Equal Opportunity Employer