Senior Thermal Engineer

Job Title: Senior Thermal Engineer

Company: Submer
Location: Houston, TX

About Submer

Submer is a leader in sustainable, cutting-edge technology solutions focused on reducing the environmental impact of data centers through innovative, energy-efficient cooling systems. We are on a mission to revolutionize how the world consumes energy in high-performance computing environments. With a strong commitment to environmental sustainability and technological excellence, Submer is paving the way for the future of data center infrastructure.

What impact you will have

As a senior thermal engineer at Submer, you will spearhead the design and optimization of cutting-edge thermal management solutions purpose-built for immersion cooling. Drawing on your deep expertise, you will be integral to our R&D initiatives—driving technical innovation that enhances cooling efficiency, ensures system reliability, and supports the integration of high-density compute and advanced power distribution architectures. Your leadership will directly enable Submer to deliver next-generation data center solutions, accelerate the adoption of sustainable cooling practices, and solidify our position at the forefront of high-performance, environmentally responsible infrastructure.

We are seeking a highly skilled and motivated engineer to lead the design, development, and validation of our immersion cooling systems for high-performance computing and data center applications. The ideal candidate will have design and hands-on experience with advanced thermal management technologies for data center applications.

What you’ll do

• Design and optimize single-phase and two-phase immersion cooling solution for electronics and high-power devices.
• Research and evaluate new materials, fluids, and system components to enhance cooling efficiency and system durability.
• Lead thermal characterization and testing of cold plates under varying heat loads and fluid conditions, ensuring efficient heat transfer and system reliability.
• Analyze and simulate thermal performance using CFD tools such as FloEFD and Ansys Fluent, and validate designs with experimental data.
• Develop and execute test plans, oversee laboratory testing, and generate detailed technical documentation and reports.
• Collaborate with suppliers and manufacturing teams to lead prototype builds, production transfer, and quality control.
• Contribute to system-level architecture studies, including fluid selection, flow control and optimization, and reliability assessments.
• Ensure compliance with safety, reliability, and environmental standards related to immersion cooling systems.
• Support root cause analysis and develop corrective actions for any failures or performance shortfalls.

What you’ll need

• Master’s or Doctoral degree in Mechanical Engineering, Thermal Engineering, Chemical Engineering, or a related field.
• 7+ years of experience in thermal/fluid systems design, with a focus on single-phase, two-phase immersion cooling and boiling/evaporation heat transfer.
• Hands-on experience with cold plate design and CDU integration.
• Proficiency with thermal and fluid modeling tools (e.g., FloEFD, ANSYS, Multiphysics, or similar). Experience with phase-change modeling is a plus.
• Familiarity with two-phase refrigerants, fluorochemical fluids, or hydrocarbon working fluids.
• Experience with thermal performance testing, data acquisition, and analysis.
• Strong problem-solving skills and a track record of driving thermal innovation in complex systems.
• Excellent communication skills and ability to work in cross-functional teams.

What we offer

• Attractive compensation package refleting your expertise and experience.
• Medical Insurance Plan.
• 401k Employee volunteer contribution Plan.
• A great work environment characterised by friendliness, international diversity, flexibility, and a hybrid-friendly approach.
• You´ll be part of a fast-growing scale-up with a mission to make a positive impact, offering an exciting career evolution.

Our job titles may span more than one job level. The actual base pay is dependent on a number of factors, such as transferable skills, work experience, business needs and market demands.

Our Inclusive Responsibility

Submer is committed to creating a diverse and inclusive environment and