Tier 2, System Administration

Castello Systems, Inc.; Corridor North (MD); On-site; USD 90,000 - 110,000; Full time

Job summary

Castello Systems, Inc. in Maryland's Corridor North seeks a seasoned IT professional to manage servers, operating systems, and core applications, performing health checks, capacity planning, and performance tuning in a collaborative, security-conscious environment.

The role includes advanced user support, incident resolution, access control administration, and participation in audits. You will work with network, security, and applications teams to improve processes and IT architecture for

Qualifications

• Experience in system administration, patching, and performance tuning.
• Strong troubleshooting skills for complex incidents.
• Familiarity with security best practices and access controls.
• Ability to collaborate across IT teams and document processes.

Responsibilities

• Monitor and maintain servers, OS, and key applications.
• Apply patches and configuration changes per change management.
• Perform health checks, capacity planning, and performance tuning.
• Provide advanced user support and incident resolution.
• Prepare system health reports for management.
• Collaborate on IT projects and document standards.

Skills

System administration

Troubleshooting

Monitoring

Security awareness

Job description

System Administration & Maintenance

• Monitor, manage, and maintain servers, operating systems, and key applications.
• Apply patches, updates, and configuration changes to systems in accordance with change management procedures.
• Perform routine system health checks, capacity planning, and performance tuning.

User Support & Troubleshooting

• Provide advanced technical support for escalated issues from help desk/Tier 1 teams.
• Diagnose and resolve system, application, and network-related problems.
• Assist with user account management, permissions, and access controls. Implementation & Configuration

Security & Compliance

• Ensure systems adhere to security best practices and organizational policies.
• Help implement and monitor security controls such as antivirus, endpoint protection, firewalls, and access management.
• Participate in audits, risk assessments, and remediation activities.

Monitoring & Reporting

• Use monitoring tools to track system performance, availability, and capacity.
• Respond to alerts, incidents, and outages, performing root cause analysis and corrective actions.
• Prepare reports on system health, incidents, and improvements for management.

Collaboration & Process Improvement

• Collaborate with IT teams (network, security, applications, help desk) on cross-functional initiatives and projects.
• Contribute to the development and refinement of IT processes, standards, and documentation.
• Provide input on technology selection and system architecture improvements.