Thermal Engineer: Data Center Cooling & CFD Innovator

OHO Group (Lithuania); San Francisco (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

OHO Group (Lithuania) is seeking a hands-on Thermal Engineer to join an AI infrastructure focus. You will bridge thermal modelling with physical hardware, simulate cooling performance, and validate designs across server, rack, and facility interfaces.

The role emphasizes early design influence, rigorous testing, and closing technical loops with stakeholders. You will develop and compare cooling options, assess both air-cooled and liquid-cooled configurations, and lead data-driven decisions from

Qualifications

• Hands-on thermal engineering experience focusing on heat transfer, fluid mechanics and thermodynamics.
• Experience designing and deploying data center infrastructure for Tier 1 or Tier 2 cloud providers.
• Direct experience building CFD or flow-network models to guide hardware decisions.
• Involvement with testing, instrumentation and model validation in real systems.
• Proficient with CFD/thermal simulation tools such as Fluent, Icepak, FloTHERM, STAR-CCM+ or COMSOL.

Responsibilities

• Develop thermal and fluid-flow models to evaluate cooling performance and identify constraints.
• Design and specify liquid-cooling solutions including CDU capacity and coolant conditions.
• Assess air-cooled and liquid-cooled configurations for high-density compute systems.
• Correlate simulation results with prototype and system-level measurements.
• Investigate thermal failures, identify root causes and drive corrective changes through testing.
• Collaborate with electrical, mechanical and systems engineers, suppliers and customers to turn requirements into practical designs.

Skills

Thermal engineering

DC infrastructure design

CFD & thermal modeling

Testing & validation

Simulation tools

Communication & ownership

Tools

Fluent

Icepak

FloTHERM

STAR-CCM+

COMSOL

Job description

OHO Group (Lithuania) is seeking a hands-on Thermal Engineer to join an AI infrastructure focus. You will bridge thermal modelling with physical hardware, simulate cooling performance, and validate designs across server, rack, and facility interfaces.

The role emphasizes early design influence, rigorous testing, and closing technical loops with stakeholders. You will develop and compare cooling options, assess both air-cooled and liquid-cooled configurations, and lead data-driven decisions from