Sr. Mechanical Engineer-Liquid Cooling Systems [Hybrid/Houston, TX - USA]

About Submer Submer designs and delivers end-to-end AI datacenter infrastructure built around industry-leading liquid cooling. We help organizations scale AI beyond the limits of traditional datacenters by enabling higher density, greater efficiency and lower environmental impact – accelerating time-to-AI from first deployment to full production. At Submer, we’re committed to creating a digital world that is safer, more efficient, and environmentally sustainable. Our technologies are addressing the critical challenges faced by data centers, supercomputing, hyperscale, and edge computing. By joining Submer, you’ll be part of a team driving innovation that directly contributes to a greener tomorrow. As we continue to grow our teams and operations in the US, we are positioning ourselves to effectively meet the increasing demand for our solutions. What impact you'll have We are seeking a Senior Mechanical Engineer to lead the design and integration of advanced liquid‑cooled rack systems for large‑scale AI and HPC deployments. This role is pivotal in defining rack‑level mechanical architectures supporting high‑power compute racks to be integrated in traditional and modular data centers (MDC). A high focus on performance, manufacturability, and serviceability across global data center environments. The ideal candidate has a strong background in system‑level mechanical design and cross‑functional collaboration with suppliers and internal product teams. What you’ll do Define and lead mechanical architecture development for liquid‑cooled racks, including manifolds, server interfaces, and facility connections. Drive system, rack‑level, and data center integration, ensuring compliance with performance, safety, structural, shock/vibration, seismic and reliability targets. Partner with rack suppliers and internal design teams to co‑develop mechanical designs aligned with company standards for performance, usability, and cost. Perform or coordinate thermal‑hydraulic analysis to optimize loop design, flow distribution, and cooling efficiency. Own CAD design, documentation, and release of mechanical components and assemblies. Lead engineering validation activities, including test plan creation, prototype builds, and root‑cause analysis of design or integration issues. Conduct design reviews to ensure manufacturability and compliance with mechanical standards and best practices (DFM, DFR, and serviceability). Collaborate with system architecture, electrical, and manufacturing engineering teams to deliver a balanced and high‑performance rack solution. What you’ll need Required BS or MS in Mechanical Engineering or related field with 8+ years of experience in mechanical design for high‑density electronics or data center systems. Proficiency in thermal‑fluid systems design, mechanical packaging, and system‑level integration. Strong experience with CAD tools (Creo or SolidWorks) and simulation tools for thermal, flow, or structural analysis (Flotherm, ANSYS, or equivalent). Proven success collaborating with external rack or cooling solution suppliers, managing specs, reviews, and validation of deliverables. Familiarity with liquid cooling infrastructure in data centers, including CDU, manifold, facility water, and interconnect standards. Excellent communication and project leadership skills across cross‑functional engineering disciplines. Preferred Qualifications Experience developing high‑power compute rack solutions or liquid cooling architectures in OEM or hyperscale environments. Knowledge of heat transfer and fluid mechanics as applied to electronic cooling solutions. Experience with material compatibility, system reliability, and environmental compliance requirements for global deployment. Hands‑on understanding of prototype build, instrumented testing, and system qualification processes. Modular Data Center (MDC) knowledge and experience is a plus. What we offer Attractive compensation package reflecting your expertise and experience. Medical Insurance Plan. 401k Employee volunteer contribution Plan. A great work environment characterized 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 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. #J-18808-Ljbffr Submer - Datacenters That Make Sense