As a Senior Systems Administrator, you will be working to enhance and support the VPN, DNS and proxy infrastructure of a highly distributed network of systems that serve as the backbone of global VPN platforms. Your primary role will be to improve performance, create new solutions for scalability and enhance existing processes.Key ResponsibilitiesDesign, enhance, and maintain internet-security platforms (VPN, DNS, proxy) through robust tooling and automation.Augment system monitoring for better availability, visibility, alerting, and proactive capacity planning.Investigate, troubleshoot, and resolve production incidents surfaced by internal monitoring or external reports.Participate in architecture and design discussions to define scalable solutions for new and existing services.Deliver project work for new business initiatives: environment build-out, infrastructure upgrades, product enhancements, and new-feature rollouts.Collaborate with peers on complex technical challenges while also executing individual contributor tasks.Participate in an 1-in-5 on-call rotation covering evenings, weekends, and holidays as business needs dictate.Professional ExperienceSenior-level Linux system administration in high-traffic, fault-tolerant environments (typically 5-7 years).Recent team lead or mentoring responsibility.Technical ExpertiseDeep Linux knowledge (CentOS/RHEL or similar), strong command-line proficiency.Virtualization: KVM / QEMU.Containers & orchestration: Docker; Swarm/Kubernetes (EKS, ECS).Scripting & automation: Bash and Python.Experience with several of the following: Salt / Salt Stack, Ansible, Puppet, Terraform, Vault.CI/CD: GitLab pipelines and related tooling.Hands-on with tools such as: Prometheus, Grafana, Nagios, Elasticsearch, Logstash, Kibana (ELK).Datacenter infrastructure and performance tuning for optimal system health.Networking & SecurityStrong understanding of TCP/IP, HTTP, DNS, routing, and packet analysis.Firewall and traffic control: iptables / ipsets.VPN protocols and proxy technologies: WireGuard, OpenVPN, StrongSwan.Personal AttributesSelf-starter who enjoys working independently and close collaboration with peers with minimal supervision.Eager problem solver who actively seeks process and performance improvements.Comfortable reading and writing technical documentation in English; day-to-day team communication is in EnglishService-oriented teammate with excellent verbal and written communication skills; able to convey complex technical concepts to non-technical stakeholders.Desired (Nice-to-Have)Experience administering Elasticsearch/Grafana/Kibana clusters at scale.Familiarity with formal change-management policies and processes.Demonstrated success supporting or evolving multiple customer-facing security products.