Network Engineer, Design & Engineering

About the role

The Infrastructure Team at Fluidstack is looking for a Network Architect to design and implement data center network fabrics from requirements through deployment. This role requires deep expertise in L1 to L3 networking, including CLOS/fat-tree topologies, BGP, EVPN/VXLAN, and lossless RDMA (RoCEv2) fabrics.

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.
• 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.
• Translate logical designs into physical reality: rack elevations, power constraints, structured cabling and fiber budgets, pathway routing, and airflow that affect equipment placement.
• Partner across Hardware, DC Operations, ICT, Software, and Validation to ensure designs are buildable and operationally sound.

Requirements

You have deep L1 to L3 expertise: CLOS/fat-tree topologies, BGP, EVPN/VXLAN, and the fundamentals underneath them. You design lossless RDMA (RoCEv2) fabrics and understand congestion management at training scale. You reason from first principles through novel design challenges rather than pattern-matching to one reference architecture. You partner across Hardware, DC Operations, ICT, Software, and Validation so designs are buildable and operationally sound.

Qualifications

• Bachelor's degree in Computer Science, Electrical Engineering, or related field.
• Minimum 5 years of experience in designing and implementing data center network fabrics.
• Experience with multi-vendor GPU platform integration and large-cluster (100k+ accelerator) experience is a plus.

Skills

• Deep understanding of CLOS/fat-tree topologies, BGP, EVPN/VXLAN, and the fundamentals underneath them.
• Experience with lossless RDMA (RoCEv2) fabrics and congestion management at training scale.
• Ability to reason from first principles through novel design challenges rather than pattern-matching to one reference architecture.
• Experience partnering across Hardware, DC Operations, ICT, Software, and Validation to ensure designs are buildable and operationally sound.

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

The base salary range for this position is $200,000 – $275,000 per year, depending on experience, skills, qualifications, and location. This range represents our good faith estimate of the compensation for this role at the time of posting. Total compensation may also include equity in the form of stock options. We are committed to pay equity and transparency.

Schedule

Full-time position.