Tier 2 System Administrator: IT Ops & Security

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

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