Senior​/Network Reliability Engineer

Senior / Staff Network Reliability Engineer

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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.

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  NREs operate RDMA fabrics, the datacenter network, and our WAN backbones.

• Super‑charge the network stack. Tune TCP/IP, RDMA (primarily RoCE congestion control), kernel‑by‑pass frameworks (DPDK, XDP, eBPF) and NIC offloads to squeeze microseconds off packet latency for AI & HPC workloads.
• Deploy & optimize l out new ToR/spine switches (from NVIDIA, Arista, Juniper, and others), validate Smart
  
  NIC and Blue Field 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.

• 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 Infini Band/RoCE.
• Proven track record scaling low‑latency, high‑throughput networks for AI/ML or HPC clusters.

• 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.

Fluidstack is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability and protected veterans’ status, or any other characteristic protected by law. Fluidstack will consider for employment qualified applicants with arrest and conviction records pursuant to applicable law.

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Mid‑Senior level

Full‑time

Engineering and Information Technology

Technology, Information and Internet