Jobs · Information Technology · Virginia

Systems Administrator SME with Security Clearance

Cornerstone Defense · Herndon, VA · 1 mo ago
Information TechnologyFull-time

Key Responsibilities

  • Provide Tier I & II support for enterprise systems and escalate advanced issues as needed.
  • Troubleshoot server, operating system, application, and connectivity issues.
  • Support daily operations, monitoring, maintenance, and upgrades for on-prem, virtual, and cloud systems.
  • Document incidents, problems, and service requests using ServiceNow.
  • Support asset management, inventory, and user onboarding activities.
  • Maintain system documentation, SOPs, and operational guides.
  • Deliver hardware within the WMA; limited travel required.
  • Provide guidance and knowledge transfer to junior team members.

Quality Assurance & Testing

  • Test and validate system builds, patches, and configuration changes across Dev/Test/Prod environments.
  • Conduct functional, integration, regression, and post-deployment tests.
  • Create test documentation including Test Plans, Test Cases, Defect Logs, and Test Reports.
  • Identify, log, and track defects through closure.
  • Create test scenarios that include both expected outcomes and failure conditions.
  • Perform smoke testing and pre/post-deployment validation for production releases.
  • Identify risks or gaps early in development.
  • Recommend areas for automated testing improvements.

Cloud & DevOps Support

  • Validate deployments in AWS, Azure, and hybrid cloud environments.
  • Verify IAM roles, access controls, and Zero Trust security configurations (ACLs, security groups, routing rules, firewall settings).
  • Verify DNS paths, connectivity, and system availability after updates or builds.
  • Confirm server build integrity through post-deployment checks (connectivity, logs, performance).
  • Ensure systems remain available after certificate updates and patching.

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