Senior Mechanical Design Engineer – Liquid Cooling Systems

Remote · Remote · Posted Oct 2, 2026

At a glance

Armada is the hyperscaler for the edge, delivering modular AI infrastructure from first deployment to AI factory with speed, scale and sovereignty. Named one of Fast Company's Most Innovative Companies and to the CNBC Disruptor 50, Armada’s solutions are deployed in over 60 countries globally for organizations ranging from energy to defense.
With nearly $500 million in funding to date, Armada is backed by leading investors including Founders Fund, Lux, BlackRock and Microsoft (M12), alongside strategic partnerships with Microsoft, Dell, Palantir, NVIDIA, SpaceX, and Skydio. 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. You’ll tackle challenges that haven’t been solved before and help build something transformative from the ground up. What you do here will not only define your career but help further Armada’s mission to bridge the digital divide for customers around the world.

Armada is seeking a 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, requiring you to own the mechanical distribution architecture.
You will establish the design rules, technical standards, interfaces, and commissioning philosophy behind the product itself in a remote-based capacity.

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.
Perform and review pipe-sizing, flow, pressure-drop, pump-head, and system-volume calculations.
Own P&IDs, mechanical schematics, equipment schedules, valve schedules, instrumentation schedules, and design calculations.
Define mechanical interfaces between factory-built modules and field-installed infrastructure.
Develop layouts that support repeatable fabrication, assembly, inspection, testing, and installation.
Define the mechanical measurement and control requirements for temperature, flow, differential pressure, pressure, leak detection, fluid level, pump status, and valve position.
Design systems for safe and efficient filling, flushing, venting, draining, testing, balancing, and startup.
Partner with thermal, electrical, controls, structural, manufacturing, commissioning, supply chain, and product teams.

7 or more years of experience designing mechanical cooling, hydraulic distribution, process cooling, or mission-critical infrastructure systems.
Experience with data centers, semiconductor facilities, industrial process cooling, central utility plants, or comparable high-reliability environments.
Strong knowledge of pipe sizing, pump selection, pressure-drop analysis, flow balancing, system volume, and hydraulic control.
Experience developing and owning P&IDs, mechanical calculations, equipment schedules, valve schedules, and instrumentation requirements.
Practical knowledge of chilled-water, condenser-water, glycol, or process-fluid systems.
Experience designing for commissioning, maintenance, isolation, flushing, venting, draining, and service access.
Ability to coordinate across engineering, manufacturing, controls, commissioning, and field teams.
Strong technical judgment and the ability to own work with limited oversight.

Experience with direct liquid cooling for AI or HPC systems.
Experience with CDUs, rack manifolds, cold plates, rear-door heat exchangers, liquid-to-liquid heat exchangers, or liquid-to-air systems.
Background in modular, prefabricated, skid-based, or containerized infrastructure.
Experience with AFT Fathom, Pipe-Flo, or comparable hydraulic modeling tools.
Familiarity with CFD, thermal modeling, or transient analysis.
Proficiency with AutoCAD, Revit, Plant 3D, SolidWorks, Inventor, or similar design tools.
Experience supporting FAT, SAT, IST, or field commissioning.
Professional Engineer license or equivalent technical depth.