Senior MEP Design Engineer - HPC/AI Data Centers

**About Submer** Submer designs and delivers end-to-end AI datacenter infrastructure built around industry-leading liquid cooling. We help organizations scale AI beyond the limits of traditional datacenters by enabling higher density, greater efficiency and lower environmental impact – accelerating time-to-AI from first deployment to full production. **What impact you will have** We are seeking a Senior MEP Design Engineer - HPC/AI Data Centers to lead the full Mechanical, Electrical, and Plumbing (MEP) design and delivery of high-performance computing (HPC) and AI data centers. This senior role owns the integrated MEP architecture for large-scale (**100-300 MW**) facilities and modular data center (MDC) deployments that scale into **50-300 MW** HPC/AI sites. You will ensure seamless coordination across mechanical, electrical, and plumbing systems to support next-generation GPU clusters, with a strong emphasis on NVIDIA Grace Blackwell (GB300) and Vera Rubin (VR200) reference architectures. This is a hands-on technical leadership position ideal for an engineer who can own end-to-end MEP design for mission-critical, high-density environments. **What you’ll do** - Lead the holistic MEP design, specification, and optimization for hyperscale and modular HPC/AI data centers, ensuring integrated performance, reliability, efficiency, and scalability. - Design electrical systems including MV/LV distribution, switchboards, overhead busways, circuit breakers, transformers (ML/VL), PDUs, grounding, protection, BESS, UPS, and generators. - Oversee mechanical systems focused on high-density liquid cooling (direct-to-chip, immersion, CDUs, in-row/in-rack solutions), CRAC/CRAH, heat rejection, airflow management, and redundancy for 100+ kW racks. - Manage plumbing and fluid systems, including coolant distribution, primary/secondary cooling loops, leak detection, piping, pumps, filtration, and integration with facility water systems or closed-loop designs. - Architect modular data center solutions (1-2 MW containers/pods) that efficiently aggregate into larger **50-300 MW**HPC/AI sites, emphasizing standardization, rapid deployment, and future-proofing. - Deliver MEP designs tailored to NVIDIA GB300 (Grace Blackwell) and VR200 (Vera Rubin) Superpod/reference architectures, addressing rack power (~120 kW+), liquid cooling manifolds, power smoothing, high-current delivery, and thermal management requirements. - Perform system-level studies (power, thermal, hydraulic, CFD) and ensure compliance with NEC, NFPA, ASHRAE, IEEE, Uptime Institute, and local codes. - Collaborate with architecture, structural, IT, and construction teams throughout design, procurement, construction, commissioning, and handover phases. - Optimize for energy efficiency, sustainability, capacity planning, fault tolerance, and total cost of ownership in AI factory environments. - Develop standards, create and review drawings/specifications, troubleshoot issues, and mentor junior MEP engineers. - Create internal and customer-facing MEP specifications and explain/discuss with technical and non-technical customers. **What you’ll need** - Bachelor’s degree (Master’s preferred) in Mechanical Engineering, Electrical Engineering, or a related MEP-focused discipline. PE license strongly preferred. - **10+ years** of progressive experience in MEP engineering for mission-critical facilities, with **at least 5-7 years** in large-scale data centers or equivalent high-density environments. - Demonstrated ability to **design complete HPC/AI data centers across all three MEP disciplines** (Mechanical, Electrical, Plumbing/Cooling). - **Proven track record** with HPC/AI data centers at **100-300 MW** scale and **modular deployments** (1-2 MW units scaling to **50-300 MW** sites). - Strong knowledge of NVIDIA **Grace Blackwell (GB300)** and **Vera Rubin (VR200)** architectures, including integrated power, cooling, and fluid system requirements. - Expertise in high-density liquid cooling, Gr…