Senior Mechanical Design Engineer - Liquid Cooling Systems

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Mechanical Design Engineer – Liquid Cooling Systems based in United States. Lead the mechanical design of advanced liquid cooling and fluid distribution systems for modular AI data center platforms. You’ll own critical cooling architecture spanning heat rejection, pumps, piping, manifolds, CDUs, rack cooling, and modular interconnects. The role combines mechanical design, hydraulic engineering, thermal infrastructure, controls, manufacturing, and commissioning. You’ll translate system requirements into repeatable designs that can be manufactured, deployed, serviced, and scaled across multiple sites. You’ll establish technical standards, interfaces, design rules, and commissioning practices that shape the underlying product architecture. Working across engineering, manufacturing, supply chain, controls, and field teams, you’ll solve complex system challenges with significant autonomy. This is an opportunity to help develop high-performance infrastructure for AI and other demanding, high-reliability environments. Accountabilities: - Own the end-to-end mechanical cooling and fluid-distribution architecture for modular data center platforms, defining primary, secondary, and rack-level cooling boundaries as well as pumping, flow control, pressure management, balancing, and redundancy strategies. - Integrate heat-rejection equipment, distribution piping, coolant distribution units, rack manifolds, rear-door heat exchangers, and other cooling interfaces into scalable architectures supporting multiple configurations and deployment sizes.

- Perform and review pipe-sizing, flow, pressure-drop, pump-head, and system-volume calculations, developing hydraulic models for water- and glycol-based systems while accounting for fluid properties, fittings, valves, strainers, heat exchangers, and equipment losses. - Define control-valve, balancing-valve, bypass, minimum-flow, and differential-pressure strategies and validate performance across normal, part-load, maintenance, startup, and failure conditions. - Own P&IDs, mechanical schematics, equipment schedules, valve schedules, instrumentation requirements, design calculations, mechanical design criteria, basis-of-design documents, and standard details. - Establish clear equipment and scope boundaries between plant systems, modules, CDUs, rack cooling, and field interconnections while maintaining disciplined revision control and technical traceability. - Review vendor drawings, submittals, calculations, and equipment selections to ensure compliance with system requirements and overall design intent. - Define mechanical interfaces between factory-built modules and field-installed infrastructure, including supply and return piping, manifolds, flexible connections, isolation valves, quick disconnects, drains, vents, and leak detection. - Develop designs that support repeatable fabrication, assembly, inspection, testing, installation, transport, rapid deployment, and phased expansion. - Standardize piping routes, fittings, valve assemblies, supports, connection points, and mechanical components where practical, while ensuring adequate equipment clearances, removal paths, service access, drainage, venting, and filter or strainer access. - Partner with manufacturing teams to resolve buildability challenges and incorporate factory and field feedback into future product revisions. - Define mechanical measurement and control requirements covering temperature, flow, pressure, differential pressure, fluid level, leak detection, pump status, and valve position. - Collaborate with controls engineers on operating sequences, alarm strategies, pump staging, variable-speed control, minimum-flow protection, equipment enablement, and failure-response logic.