Tier 3 Infrastructure Engineer

Top Prospect Group; Connecticut; Hybrid; USD 90,000 - 95,000; Full time

Job summary

Top Prospect Group is seeking a highly skilled Tier 3 Infrastructure Engineer to support, maintain, and enhance our enterprise IT infrastructure in Hartford County. This role focuses on Windows Server environments, Active Directory, Exchange, and core networking components.

You will lead infrastructure projects, mentor Tier 1/2 teams, ensure security and disaster recovery, and participate in on-call rotation.

Qualifications

• Experience as Tier 3 Infrastructure Engineer or similar role.
• Strong Windows Server, Active Directory, and enterprise applications.
• Hands-on network hardware and protocols, virtualization and cloud knowledge a plus.

Responsibilities

• Provide Tier 3 support for Windows servers, AD, Exchange, and related apps.
• Configure, monitor, and maintain core infrastructure components (switches, routers, firewalls).
• Troubleshoot escalated system, server, and networking issues to minimize downtime.
• Perform upgrades, patching, and migrations with minimal business disruption.
• Mentor Tier 1/2 teams and share knowledge.
• Enforce security best practices and monitor for vulnerabilities.
• Manage backups, DR, and business continuity planning.
• Document configurations and troubleshooting procedures.
• Participate in on-call rotation for critical incidents.

Skills

Windows Server

Active Directory

Networking

Troubleshooting

Education

Microsoft MCSA/MCSE

Cisco CCNA/CCNP

CompTIA Security+

Tools

VMware

Hyper-V

Azure

AWS

Job description

Hybrid Work to Start ---> Remote / 90-95k / Hartford County, CT

We are seeking a highly skilled Tier 3 Infrastructure Engineer to support, maintain, and enhance our enterprise IT infrastructure. This role requires deep expertise in Windows servers and related applications, as well as strong hands-on experience with networking technologies including switches, firewalls, and routing. The Tier 3 Engineer will serve as an escalation point for complex issues, lead infrastructure projects, and ensure the stability, security, and scalability of systems across the organization.

Responsibilities

• Provide Tier 3 support for Windows servers, Active Directory, Exchange, and related applications.
• Configure, monitor, and maintain core infrastructure components, including networking switches, routers, and firewalls.
• Troubleshoot and resolve escalated system, server, and networking issues to minimize downtime.
• Perform system upgrades, patching, and migrations while ensuring minimal business disruption.
• Collaborate with Tier 1 and Tier 2 teams to provide mentorship and knowledge transfer.
• Implement and enforce security best practices, monitoring systems for vulnerabilities and threats.
• Manage backups, disaster recovery, and business continuity planning for critical infrastructure.
• Document infrastructure configurations, processes, and troubleshooting procedures.
• Participate in on-call rotation for critical incidents as required.

Qualifications

• Proven experience as a Tier 3 Infrastructure Engineer, Systems Engineer, or similar role.
• Strong expertise in Windows Server environments, Active Directory, and related enterprise applications.
• Hands-on experience with networking hardware (switches, routers, firewalls) and protocols (TCP/IP, DNS, DHCP, VPN).
• Knowledge of virtualization platforms (VMware, Hyper-V) and cloud services (Azure, AWS) is a plus.
• Familiarity with security frameworks and compliance standards.
• Excellent problem-solving and communication skills.
• Relevant certifications such as Microsoft (MCSA/MCSE), Cisco (CCNA/CCNP), or CompTIA Security+ are highly desirable.