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 is proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, veteran status, or any other protected category under applicable law.

Locations Houston (Hybrid) Remote status Hybrid