Senior Mechanical Design Engineer - Liquid Cooling Systems

About the Company

Armada is the hyperscaler for the edge, delivering modular AI infrastructure from first deployment to AI factory with speed, scale and sovereignty. Armada’s solutions are deployed in over 60 countries for organizations ranging from energy to defense. Armada is backed by investors including Founders Fund, Lux, Black Rock and Microsoft (M12).

We are building the infrastructure layer for sovereign and edge AI — rugged, deployable compute for customers that cannot rely on centralized cloud. Working at Armada means taking ownership, driving autonomy, and delivering impact.

• Senior Mechanical Systems / Design Engineer to lead the design and development of liquid cooling and mechanical distribution systems for modular AI data center platforms.
• This role sits at the intersection of mechanical design, hydraulic engineering, thermal infrastructure, manufacturing, controls, and commissioning.
• Own the mechanical distribution architecture connecting heat-rejection equipment, pumps, piping, manifolds, coolant distribution units, rack cooling systems, and modular interconnects. Translate system requirements into practical, serviceable, and repeatable designs that can be manufactured in a factory and deployed consistently across multiple sites.
• Not a traditional consulting or drawing-review role. Help establish the design rules, technical standards, interfaces, and commissioning philosophy behind the product itself.

Mechanical and Liquid Cooling Architecture

• Own the end-to-end mechanical cooling and fluid-distribution architecture for modular data center platforms.
• Define primary, secondary, and rack-level cooling boundaries.
• Establish pumping, flow-control, pressure-management, balancing, and redundancy strategies.
• Align heat-rejection equipment, distribution piping, CDUs, rack manifolds, rear-door heat exchangers, and other cooling interfaces.
• Develop scalable architectures that support multiple product configurations and deployment sizes.

• Perform and review pipe-sizing, flow, pressure-drop, pump-head, and system-volume calculations.
• Develop hydraulic models for water and glycol-based systems.
• Account for fluid concentration, viscosity, temperature, fittings, valves, strainers, heat exchangers, and equipment pressure losses.
• Define control-valve, balancing-valve, bypass, minimum-flow, and differential-pressure strategies.
• Validate system performance across normal, part-load, maintenance, startup, and failure conditions.

• Own P&IDs, mechanical schematics, equipment schedules, valve schedules, instrumentation schedules, and design calculations.
• Develop mechanical design criteria, basis-of-design requirements, and standard details.
• Define clear equipment and scope boundaries between plant systems, modules, CDUs, rack cooling, and field interconnections.
• Maintain disciplined revision control and technical traceability across the mechanical design package.
• Review vendor drawings, submittals, calculations, and equipment selections for compliance with system intent.

• Define mechanical interfaces between factory-built modules and field-installed infrastructure.
• Develop repeatable interconnect strategies for supply and return piping, manifolds, flexible connections, isolation valves, quick disconnects, drains, vents, and leak detection.
• Establish labeling, connection, access, and installation standards to reduce field variability.
• Support product configurations designed for transport, rapid installation, and phased expansion.

• Develop layouts that support repeatable fabrication, assembly, inspection, testing, and installation.
• Standardize piping routes, fittings, valve assemblies, supports, connection points, and mechanical components where practical.
• Coordinate equipment clearances, removal paths, service access, drain points, vent points, and filter or strainer access.
• Partner with manufacturing teams to resolve buildability issues and improve future revisions.
• Translate field and factory feedback into product improvements.

• Define…