Systems Administrator

Responsibilities

• Administer Windows servers on VMware vSphere, including patching, provisioning, backups, and capacity planning.
• Manage AWS resources including EC2, VPC, IAM, S3, Lambda, and RDS (PostgreSQL), and support workloads migrating to the cloud.
• Maintain compliance across frameworks such as PCI DSS and SOC 2.
• Monitor cloud health and spend through CloudWatch and Cost Explorer.
• Manage Active Directory, DNS, DHCP, and Group Policy in a hybrid identity environment synced to Microsoft Entra.
• Manage DNS zones and records, and handle the SSL/TLS certificate lifecycle including issuance, renewal, and deployment.
• Support Cisco switching and carry out Palo Alto firewall changes under change control.
• Own monitoring and alerting in Nagios, including tuning checks, refining alert thresholds, and maintaining coverage.
• Build and maintain searches, dashboards, and alerts in Splunk.
• Run Veeam backup jobs and regularly validate restores.
• Support endpoint security tooling including SentinelOne, Microsoft Defender for Endpoint, and AppLocker.
• Respond to incidents, document root cause, and carry out remediation.
• Keep runbooks, documentation, and asset inventory accurate and current.
• Follow change management and documented security controls in all work.