Senior Thermal Engineer - SoC to Rack Integration

Majestic Labs • Los Altos, CA

3d • Onsite

About The Position

We are seeking a Senior Thermal Engineer with 10+ years of experience to own the full thermal design lifecycle of advanced cooling systems for high-performance computing hardware. This is an on-site, individual contributor role for a candidate with deep hands-on expertise in liquid cooling architecture from silicon-level cold plate design through rack-scale fluid infrastructure, CFD simulation, and AI/GPU-based system design.

Requirements

• 10+ years of thermal engineering experience with deep expertise in liquid cooling systems spanning SoC-level and rack-level implementations in high-performance or data center environments.
• B.S. or M.S. in Mechanical Engineering or a related field.
• Proven track record of owning at least one full product lifecycle — from concept through high-volume manufacturing (HVM).
• Liquid Cooling Expertise: Expert-level experience in cold plate design for high-power silicon devices and rack-level liquid-cooled manifold systems, including micro-channel optimization, blind-mate quick disconnect integration, and full loop architecture from node to rack scale.
• Fluid Systems & Simulation: Deep understanding of water pressure dynamics, flow balancing, and leak-mitigation best practices, with proficiency in CFD tools (e.g., Ansys Fluent, Icepak, or equivalent) to simulate and validate complex thermal and fluid systems from component to system level.
• Familiarity with airflow principles and air cooling requirements for high-density server and rack architectures.
• Direct experience with AI/GPU-based compute architectures and ultra-high-density power delivery systems.

Nice To Haves

• Direct experience with thermal interface materials (TIMs), including selection, characterization, and application in high-power assemblies.
• Deep familiarity with Open Compute Project (OCP) or ORV3 standards.
• Experience with blind-mate liquid and power interfaces.

Responsibilities

• Own end-to-end thermal design from concept through production, spanning SoC-level cold plate development through rack-scale liquid cooling infrastructure, including hybrid air and liquid cooling systems.
• Design and optimize high-power silicon cold plates, including internal micro-channel geometry, thermal interface integration, and fluid inlet/outlet configuration directly at the SoC package level.
• Architect and validate rack-level liquid cooling infrastructure including manifold layout, blind-mate quick disconnect integration, and full loop pressure and flow management.
• Drive CFD simulation efforts to validate cooling strategies for high-density nodes, optimizing fluid flow, pressure drop, and heat transfer from chip to rack.
• Partner closely with internal hardware teams and external partners to deliver integrated thermal solutions for AI/GPU-based platforms.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: Associate degree