Senior Site Reliability Engineer - Traffic Engineering | NordVPN

Full Time

hybrid

Infrastructure

Warsaw / Krakow

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

Salary Range

Gross Salary 23300 - 34000 PLN/Month

Perks we offer

Our global mission fuels our drive. But when you need that extra push - here’s a list of things to look forward to.

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Infrastructure

Warsaw / Krakow

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