Senior Site Reliability Engineer - Traffic Engineering - NordVPN
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Nord-security · PolandPrepare for this interview
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The world's most advanced VPN, and a whole lot more. If you're a curious problem-solver who carves their own path, join the team behind Threat Protection Pro, the NordLynx protocol, and the fastest VPN on the planet-tools that put privacy, security, and control back in people's hands. Your impact? Helping millions take back control of their online security, privacy, and data. NordVPN serves millions of users through a global edge network. Your number one responsibility is content accessibility - making sure traffic reaches users reliably, quickly, and securely, everywhere in the world. You'll work at the intersection of networking, load balancing, and traffic shaping. When something is slow, unreachable, or misbehaving at the protocol level, you're the person who finds out why and fixes it. Main Responsibilities Ensure content accessibility across a globally distributed edge infrastructure Design, operate, and improve load balancing and traffic shaping systems at scale Troubleshoot connection, latency, and accessibility issues end to end Own HTTP traffic flow - from client to edge to origin and back Investigate and resolve website and service reachability problems Work across protocol layers to diagnose issues at the right depth Core Requirements Load balancing and traffic shaping - architecture, algorithms, health checking, failover NGINX and/or HAProxy - configuration, tuning, debugging in high-traffic environments Networking fundamentals - DNS, routing, firewall, packet capture and analysis OSI model fluency - comfortable working across L3-L7, TCP internals, SSL/TLS handshake and termination SaltStack Linux administration Python programming - automation, tooling, scripting Troubleshooting network and application-layer issues in production at scale Observability knowledge - metrics, logging, and monitoring for traffic systems Docker knowledge - full lifecycle and dependency management with advanced networking Bonus Points For Advanced networking - anycast, BGP, traffic engineering at the network layer Deep understanding of the HTTP protocol - HTTP/1.1, HTTP/2, HTTP/3, WebSocket, connection lifecycle Proxy protocols - PROXY protocol v1/v2, reverse proxy patterns, header propagation
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