Senior Site Reliability Engineer - VPN Service | NordVPN

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 Nord Lynx 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.

• 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

• 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

• 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

• Linux kernel and networking stack
• Salt Stack
• Consul
• Firewall - nftables
• DNS - BIND, dnsdist, Unbound
• FreeRADIUS
• Vault and PKI infrastructure
• MySQL (Percona), Redis
• Docker
• iPXE

Innovate with industry leaders

Work alongside global experts to build world-leading cybersecurity tools, impacting millions of users around the world.

Learn & grow

Boost your skills via our extensive training programs (online and offline) & other resources. Benefit from mentorship and career-switch opportunities to grow within the company.

Hybrid work

Enjoy the flexibility with 3 office days and working from home for the remaining 2.

Work from anywhere

Recharge with a change of scenery – choose work from any location when you feel a need to power your creativity and drive.

Physical well-being

Boost your health with free-of-charge 24/7 gym access, onsite and online workouts, and consultations led by in-house Physical Well-Being experts.

Mental & emotional health

Nurture your mind with free psychologist consultations, dedicated mental health events, and premium access to top-rated wellness apps like Calm, Headspace, and Mindletic.

Premium healthcare

Receive private health insurance giving you peace of mind for your health needs.

Extra days off

Enjoy additional vacation days off as you grow with us. Plus, get extra days for sick leave, special occasions, or parenting needs.

Joyful moments – special treats

Celebrate life’s big moments with special gifts from us on your birthday, anniversary, and other major events, such as weddings or the arrival of a new family member.

Company events & team-building

Experience iconic Nord Security celebrations, team-buildings, and knowledge-sharing events, nurturing bonds that fuel our success.

Workation

Embark on a legendary company getaway abroad, filled with exciting activities, live concerts, engaging workshops, and epic time together.