Senior / Staff Network Reliability Engineer

Job Overview

At Fluidstack, we’re building the infrastructure for abundant intelligence. We partner with top AI labs, governments, and enterprises - including Mistral, Poolside, Black Forest Labs, Meta, and more - to unlock compute at the speed of light. We’re working with urgency to make AGI a reality. As such, our team is highly motivated and committed to delivering world-class infrastructure. We treat our customers’ outcomes as our own, taking pride in the systems we build and the trust we earn.

About the Role

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.

Focus:

• 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.

About You

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.

Salary & 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. The base salary range for this position is $250,000 - $400,000 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.