Senior Site Reliability Engineer - VPN Service - NordVPN
External
Nord-security · Vilnius, LithuaniaPrepare for this interview
EliteAI-generated questions, company research, and talking points tailored to this role
Benefits
Additional Information
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 operates a globally distributed VPN and DNS infrastructure serving millions of users. Your responsibility is the service itself - deploying, managing, and improving VPN nodes worldwide while ensuring every client connection is fast, stable, and secure. You'll work closely with application teams to guarantee smooth client connectivity end to end. Quality and reliability are the job. Main responsibilities Deploy and manage globally distributed VPN and DNS services Ensure connection quality, stability, and performance across the entire node fleet Collaborate with application teams on client connectivity and protocol behavior Optimize VPN service performance - kernel tuning, flamechart analysis, profiling Manage security posture - firewalls, PKI, certificate lifecycle, hardening Manage authentication and authorization infrastructure Own configuration management and automated provisioning of infrastructure Clear written incident communication and postmortem ownership Core requirements Own critical VPN services end-to-end including architecture, scalability, security and monitoring Deliver OKRs and key commitments within agreed timelines Write RFCs/ADRs for new features, refactors, etc Raises engineering quality through standards, design reviews, knowledge sharing and mentorship Balances reliability, security and delivery speed with strong operational judgment Advanced networking - VPN protocols, tunneling, routing, DNS Linux at depth - kernel internals, tuning, module management Firewall management Performance analysis - flamecharts, profiling, bottleneck identification OSI model fluency - L2 through L7, TCP/IP stack, SSL/TLS Security fundamentals - PKI, certificate management, hardening Authentication and authorization - RADIUS, access control Configuration management and automated deployments Load balancing and failover for distributed services Docker Bonus Points For Python programming C, Rust, or Go - for lower-level service and performance work Observability knowledge - monitoring, metrics, logging for VPN services On-demand bare-metal/hardware provisioning eBPF, strace, and advanced debugging/tracing tools Virtualization - KVM, MicroVM Kubernetes networking Interest in AI tooling - Claude Code, agentic engineering, LLM integrations in engineering workflows Tools You Will Use Linux kernel and networking stack SaltStack Consul Firewall - nftables DNS - BIND, dnsdist, Unbound FreeRADIUS Vault and PKI infrastructure MySQL (Percona), Redis Docker iPXE
Your Match
How well this role fits your profile.
Company Intel
What employees say
Worked at nord-security? Share your experience