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 stra