Network Engineer

Network EngineerLocation: Austin, TX (Onsite)N/VXLAN overlays, migrating racks from L2 bridged to L3 routed boundaries. IPv6 operations: first-hop security (RA guard, address locking), DHCPv6 relay and MAC-stable allocation behavior including client identifier pitfalls, /64 per rack scale planning and fabric design Precision timing: PTP (IEEE 1588) design and troubleshooting, grandmaster placement, boundary and transparent clock concepts, sync quality monitoring against microsecond budgets. Fabrics for AI/HPC: PFC and lossless Ethernet tuning, link training, SerDes and optics basics (current generation high speed optics), awareness of how skew and tail latency hit collective communication. Optical and physical plant: fiber types and connectors, optical circuit switching concepts, commercial traffic generators, cable validation, fiber characterization from hardware timestamps. Access security: port ACLs, 802.1X/MAB flows, RADIUS, quarantine and remediation VLANs, device onboarding and registration. Multi-vendor fluency: deep on at least one datacenter NOS (Arista, Cisco, Juniper, SONiC) with demonstrated ability to pick up others, including API driven operation with rollback. Troubleshooting under pressure: packet level debugging, hardware timestamp analysis, method of procedure authorship, maintenance windows, rollback planning. Required: automation and software Python for network automation: device APIs, text templating, input validation, operator CLI tooling. Templating: Jinja2 template design (reuse across sites and roles, safe defaults, per-port rendering from inventory). Config as code: distributed revision control fluency (branch, review, land, revert), config review culture, CI gates on generated config (diff review, automated land criteria). Intent modeling: declarative source of truth thinking where inventory plus intent renders device config, and generated config is never hand edited. Linux networking: interfaces, routing tables, namespaces, capture tooling, service management, cookbook style config management (chef). Data hygiene: inventory accuracy (roles, port maps, serial to port bindings), drift detection, reconciliation loops. Required: operations and delivery Lab or datacenter operations: oncall rotations, incident response, break/fix prioritization, vendor RMAs, multi-site coordination. Change discipline: method of procedure authorship and peer review, blast radius control, pilot then scale. Cost awareness: circuit inventories, carrier coordination for turn-down, tracking recurring spend to zero with chargeback confirmation. Cross-functional delivery: shared ownership with platform teams (provisioning, observability), hardware bring-up teams, and lab customers, including consultative support outside the plan of record. Preferred AI/HPC cluster networking: scale-up versus scale-out fabric design, RDMA capable fabrics, collective sensitivity to timing. Large fiber plant or optical switching operations. IPv6-first or IPv6-only environments at scale. Observability: time series metrics, topology visualization, low-noise alert design. Vendor evaluation: switch selection criteria, optics compatibility testing.