Onsite Infrastructure Security Admin – Windows/AD, VMware

CBTS; Chicago (IL); On-site; USD 69,000 - 83,000; Full time

Job summary

CBTS is seeking an Infrastructure Security Administrator to support and secure our on-premise enterprise infrastructure in Chicago. This contract role focuses on hardening Windows server environments, Active Directory, DNS/DHCP, and core services while improving security posture.

The ideal candidate has 3–5 years of hands-on experience with Windows Server administration, AD, group policy, and virtualization platforms (VMware/Hyper-V), and a proven track record in vulnerability remediation and

Qualifications

• Bachelor's degree in IT, Computer Science, or equivalent experience.
• 3–5 years of experience administering Windows server environments.
• Strong experience with Active Directory, Group Policy, DNS, and DHCP.
• Experience with vulnerability remediation, security patch management, and hardening.
• Experience supporting VMware or Hyper-V environments.

Responsibilities

• Secure and optimize the enterprise infrastructure.
• Hardening Windows server environments and core infrastructure services.
• Manage vulnerability remediation and security patching.
• Support VMware or Hyper-V virtualization environments.
• Drive security remediations across the organization.

Skills

Windows Server

Active Directory

Group Policy

DNS

DHCP

Vulnerability remediation

Patch management

System hardening

VMware

Hyper-V

Education

Bachelor's degree in IT / CS

Tools

VMware

Hyper-V

Job description

CBTS is seeking an Infrastructure Security Administrator to support and secure our on-premise enterprise infrastructure in Chicago. This contract role focuses on hardening Windows server environments, Active Directory, DNS/DHCP, and core services while improving security posture.

The ideal candidate has 3–5 years of hands-on experience with Windows Server administration, AD, group policy, and virtualization platforms (VMware/Hyper-V), and a proven track record in vulnerability remediation and