Senior / Staff Network Reliability Engineer

FluidStack • San Francisco, CA

75d

About The Position

Our Network Reliability Engineers are the backbone of Fluidstack's platform. You'll utilize deep networking expertise and software engineering to keep our high-performance network fabrics fast, reliable and cost-efficient at scale. Our NREs operate RDMA fabrics, the datacenter network, and our WAN backbones.

Requirements

• 7+ yrs in network-heavy SRE, performance engineering or data-center networking.
• Mastery of Linux networking stack and protocol-level debugging (TCP, IB, RoCE).
• Production experience with many vendors (Mellanox/NVIDIA, Arista, Juniper, etc.), multi-layer fabrics, and network overlays (VXLAN, Geneve).
• Fluency in Python, Go or Rust; solid Infra-as-Code & CI/CD chops.
• Familiarity with DPDK, XDP, eBPF and InfiniBand/RoCE.
• Proven track record scaling low-latency, high-throughput networks for AI/ML or HPC clusters.

Responsibilities

• Super-charge the network stack. Tune TCP/IP, RDMA (primarily RoCE congestion control), kernel-bypass frameworks (DPDK, XDP, eBPF) and NIC offloads to squeeze microseconds off packet latency for AI & HPC workloads.
• Deploy & optimize at scale. Roll out new ToR/spine switches (from NVIDIA, Arista, Juniper, and others), validate SmartNIC and BlueField networking, configure BGP/EVPN fabrics, and optimize flow control (PFC, ECN) for zero-loss transport.
• Automate observability. Build NIC-to-orchestrator telemetry pipelines, packet-loss detection bots, and real-time throughput/latency dashboards.
• Root-cause the gnarly stuff. Lead packet captures, congestion analyses and latency regressions; turn insights into switch firmware patches, kernel tuning and topology optimizations.
• Drive vendor collaboration. Pair with networking vendors to debug hardware, accelerate RDMA paths, validate optics, and integrate emerging network hardware (800G/1.6T, LPO/CPO).
• Continuously improve. Inject link failures, run game-days simulating network partitions and codify post-mortem learnings into SLIs/SLOs that matter to customers.

Benefits

• Competitive total compensation package (cash + equity).
• Retirement or pension plan, in line with local norms.
• Health, dental, and vision insurance.
• Generous PTO policy, in line with local norms.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Number of Employees: 11-50 employees