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 half a billion dollars in funding, Armada is backed by top investors such as Microsoft (M12), Founders Fund, and BlackRock, and has collaborations and partnerships including NVIDIA, Palantir and Dell Technologies. We are looking for the most brilliant minds in the world to join us.  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 lessons-learned incorporation into future revisions   Required Qualifications 7+ years of experience in hydronic distribution design for data centers, industrial systems, mission-critical HVAC, or comparable thermal infrastructure   Strong experience owning P&IDs, valve strategies, and instrumentation design   Practical field knowledge of commissioning, startup, and serviceability constraints   Experience with glycol-based cooling systems such as PG25 or equivalent   Strong understanding of pipe sizing, flow management, pressure drop, balancing, and measurement strategies   Proven ability to maintain documentation discipline, revision control, and interface clarity   Strong cross-functional collaboration skills across mechanical, controls, manufacturing, and field teams   Preferred Experience and Skills Experience with liquid-to-liquid and liquid-to-air cooling systems for h