Senior Site Reliability Engineer - VPN Service | NordVPN

Nord Security

• $110K — $130K *
Poland, ME 04274In-Person
Information Technology
Less than 5 years of experience
Today
Be an Early Applicant
Job Overview by Ladders

Qualifications

  • 5-7 years of hands-on experience in network engineering roles
  • Proficiency in managing VPN protocols, tunneling, and routing
  • Deep understanding of Linux internals, specifically kernel tuning and management
  • Experience with firewall management and security best practices
  • Familiarity with configuration management and automated deployment tools

Responsibilities

  • Deploy and manage global VPN and DNS services
  • Ensure network stability and performance across node fleet
  • Collaborate with application teams on connectivity issues
  • Optimize performance through analysis and tuning
  • Manage security including firewalls and PKI lifecycle
  • Oversee authentication and authorization infrastructure
  • Conduct clear incident communication and handle postmortem analyses

Benefits

  • Opportunities for professional growth and mentorship
  • Engagement with cutting-edge technologies in networking
  • Chance to work with a dynamic, globally distributed team
  • Access to collaborative problem-solving environments
  • Support for continuous learning and development initiatives
Full Job Description
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
* Ladders Estimates

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