Network Engineer, Design & Engineering
Fluidstack•New York, NY
•$202,000 - $261,000
About The Position
Fluidstack is building civilization-scale infrastructure for AI, focusing on delivering 10 to 100s of GWs of compute faster than anyone else. This involves rethinking every layer of the stack, from acquiring power to designing and operating data centers. The Infrastructure Team is responsible for designing the network fabrics that power AI training and inference, creating lossless, non-blocking backend networks for clusters of over 100,000 accelerators. They aim to generate designs from a source-of-truth model, enabling rapid and correct network design.
Requirements
- Designed data center network fabrics from requirements through deployment, not just configured them, and can explain the tradeoffs behind every decision.
- Deep L1 to L3 expertise: CLOS/fat-tree topologies, BGP, EVPN/VXLAN, and the fundamentals underneath them.
- Design lossless RDMA (RoCEv2) fabrics and understand congestion management at training scale.
- Reason from first principles through novel design challenges rather than pattern-matching to one reference architecture.
- Partner across Hardware, DC Operations, ICT, Software, and Validation so designs are buildable and operationally sound.
Nice To Haves
- Source-of-truth-driven design generation.
- Multi-vendor GPU platform integration.
- Large-cluster (100k+ accelerator) experience.
Responsibilities
- Own the network design lifecycle from customer requirements (GPU shape, workload, scale, tenancy) through deployable, validated architectures for AI training and inference.
- Produce topology designs, IP/addressing schemes, routing policy, and fabric configuration specs across front-end, back-end (GPU-to-GPU training fabric), and storage networks.
- Adapt architectures to different GPU platforms (NVIDIA, AMD, custom accelerators), form factors, and workload profiles, each with its own rack layout, power envelope, and cabling approach.
- Translate logical designs into physical reality: rack elevations, power constraints, structured cabling and fiber budgets, pathway routing, and airflow that affect equipment placement.
- Design lossless Ethernet fabrics for RDMA (RoCEv2): PFC, ECN tuning, traffic classes, and congestion management, reasoning about ECMP and collective-communication patterns in distributed training.
- Produce HLDs, LLDs, cutsheets, BOMs, cabling matrices, and design decision records, and lead design reviews and reusable reference architectures.
Benefits
- Competitive total compensation package (salary + equity).
- Retirement or pension plan, in line with local norms.
- Health, dental, and vision insurance.
- Generous PTO policy, in line with local norms.
- Pay equity and transparency.
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What This Job Offers
Job Type
Full-time
Career Level
Senior
Education Level
No Education Listed
