Senior Site Reliability Engineer - Traffic Engineering | NordVPN

NordVPN serves millions of users through a global edge network. The role focuses on ensuring content accessibility by making sure traffic reaches users reliably, quickly, and securely worldwide.

• 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

Nice to have:

• 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

• 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

Candidates must provide accurate and complete information during recruitment. Limited use of AI tools to refine application materials is acceptable, but candidates are responsible for their submissions. Applications may be processed using automated tools for evaluation, supporting but not replacing human decision-making. Candidates can opt out of automated evaluation by submitting applications directly via email.