Thermal Engineer - SoC to Rack Integration

Socket.dev; Los Altos (CA); On-site; USD 140,000 - 185,000; Full time

Job summary

Majestic Labs is seeking a Senior Thermal Engineer with 10+ years of hands-on experience to own the full thermal design lifecycle of advanced cooling systems for high-performance computing hardware. This on-site role spans silicon-level cold plate design through rack-scale liquid cooling and CFD validation for AI/GPU platforms.

You will lead end-to-end thermal solutions, collaborating with hardware teams and external partners.

Qualifications

• 10+ years of thermal engineering experience in liquid cooling for high-performance/computing or data-center environments.
• B.S./M.S. in Mechanical Engineering or related field.
• Proven track record owning a full product lifecycle from concept to high-volume manufacturing.
• Expert-level silicon cold-plate design and rack-level liquid cooling incl. micro-channel optimization and integration.

Responsibilities

• Own end-to-end thermal design from concept through production for high-density compute systems.
• Design and optimize silicon cold plates and rack-scale cooling infrastructure.
• Architect and validate liquid cooling loops, including manifold layout and connections.
• Lead CFD studies to optimize flow, pressure drop, and heat transfer from chip to rack.
• Collaborate with internal hardware teams and external partners to deliver integrated thermal solutions.

Skills

Liquid cooling design

CFD/Fluid simulation

SoC-to-rack-scale design

AI/GPU compute architectures

Thermal interface design

Education

B.S. or M.S. in Mechanical Engineering

Tools

ANSYS Fluent

Icepak

CFD tools

Job description

About Majestic Labs

We’re a fast-moving, US-Israeli AI startup building next-generation infrastructure for the world’s most demanding AI workloads. Our mission is to accelerate the future of intelligence and make it ubiquitously accessible by delivering full stack custom AI servers optimized for large-scale inference and training.

Backed by top-tier investors and led by industry veterans, we’re scaling rapidly. We seek forward-thinking engineers and operators who thrive in a collaborative environment and excel at solving complex challenges from first principles. If you want to build infrastructure that fundamentally changes what the world can accomplish with AI, come join us!

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.

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.

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.

Preferred Qualifications

• 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.

At Majestic Labs, we are shaping the next paradigm and making AI ubiquitous by building radically better infrastructure across the entire stack-from systems engineering and VLSI to compilers and AI applications. This epic mission requires a relentless culture of innovation, grit, and dedication. Our employees are our most important asset.

Have you read the job description and feel you could be a great fit?

We seek smart, curious, self-driven individuals who enjoy creative problem-solving and continuous learning. Even if you don't meet all requirements, we'd love to hear from you if you have the mindset to tackle complex challenges.

Majestic Labs is an equal opportunity employer deeply committed to diversity of background and thought. If you are ready to dare greatly, learn from mistakes, engage in vigorous debates, and help create a step‑function shift in human technical capability-we want to meet you!