Senior Systems Administrator

Description

• Design, 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.

• Senior-level Linux system administration in high-traffic, fault-tolerant environments (typically 5-7 years).
• Recent team lead or mentoring responsibility.

• Deep 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.

• Strong understanding of TCP/IP, HTTP, DNS, routing, and packet analysis.
• Firewall and traffic control: iptables / ipsets.
• VPN protocols and proxy technologies: WireGuard, OpenVPN, StrongSwan.

• Self-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 English
• Service-oriented teammate with excellent verbal and written communication skills; able to convey complex technical concepts to non-technical stakeholders.

• 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.