Mechanical Engineer - Hydronics

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. 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.

About the role

We are looking for a Mechanical Engineer - Hydronics (Distribution Focus) to own the mechanical distribution architecture for our modular liquid-cooled data center platform. This role is responsible for the piping, valves, instrumentation, module interconnects, and serviceability strategy across both the primary water loop and secondary PG25 loop .

This is a hands-on architecture and execution role focused on building a system that is repeatable, commissionable, maintainable, and scalable across multiple deployments. The right candidate will bring deep hydronic distribution expertise and a practical understanding of what it takes to move a design from concept into manufacturing, field installation, startup, and long-term operation.

You will work closely with internal engineering teams, OEMs, fabricators, controls, manufacturing, and commissioning leads to ensure the mechanical distribution layer is robust, standardized, and ready for real-world deployment.

Location. This role is remote.

What You'll Do (Key Responsibilities)

Hydronic Architecture Ownership

Own the hydronic distribution architecture across:

Primary water/PG25 loop

Secondary water/PG25 loop

Define and standardize system design rules for flow, pressure drop, balancing, and measurement

Establish practical design approaches for PG25 and water-based systems, including pipe sizing, fluid behavior, and maintainability considerations

Support system-level alignment between plant, distribution, and rack cooling interfaces

Distribution Design and Interface Control

Own distribution P IDs, valve schedules, and instrumentation schedules

Maintain revision discipline, tagging standards, and interface clarity across the mechanical distribution package

Define boundaries and interfaces between plant equipment, CDUs, rack cooling components, and module-to-module interconnects

Develop and maintain interface control documentation for hydronic system boundaries

Commissioning-First Design

Design for startup, commissioning, and long-term operation

Define fill, flush, vent, drain, isolation, bypass, and strainer strategies

Establish measurement points for flow, differential pressure, and temperature

Partner with commissioning and controls teams to define what must be measured, how it will be measured, and what acceptable startup performance looks like

Pipe Sizing and Pressure Drop Management

Own pipe sizing methodology and pressure drop strategy for both PG25 and water loops

Define practical approaches to balancing and instrumentation placement

Ensure real-world field performance aligns with design intent

Help establish repeatable standards for distribution performance across product variants

Layout, Serviceability, and Buildability

Own mechanical distribution layout packages and service clearance requirements

Ensure systems are designed for safe access, maintenance, replacement, and long-term serviceability

Support design for manufacturing by standardizing routing approaches, fittings strategy, tolerances, and assembly expectations

Help define clear factory-built versus field-installed scope boundaries

Modular Interconnect Strategy

Define standard module interconnect approaches, including manifolds, quick connects, labeling, boundary isolation, and leak detection interfaces as applicable

Ensure interconnect designs support rapid deployment while preserving reliability and maintainability

Drive consistency across builds to reduce site variability and improve product repeatability

Cross-Functional Integration

Partner with mechanical plant, thermal, electrical, controls, manufacturing, and commissioning teams

Coordinate system interfaces without losing baseline discipline

Work with OEMs and fabricators while maintaining ownership of the internal distribution architecture and standards

Support factory builds, field feedback collection, and…