Senior Systems & Infrastructure Engineer

Senior Systems & Infrastructure Engineer New York Metropolitan Area | Primarily Remote with Occasional Client-Site Work Full-Time | $90,000-$120,000 Solve the Problems Other Engineers Escalate GEM Technologies is looking for an experienced Senior Systems & Infrastructure Engineer who enjoys solving difficult technical problems and taking ownership of them through resolution. This is a hands-on senior infrastructure position, not a management role or traditional help desk position. You will be one of the technical resources our team and clients rely on for complex infrastructure issues, production incidents, escalations, migrations and projects across multiple client environments. We are looking for an engineer who can step into a difficult situation, troubleshoot across technologies, determine the root cause, communicate clearly with the people involved, and remain accountable until the issue is resolved. If you enjoy being the engineer brought in when standard troubleshooting has not solved the problem, this may be a good fit. What You'll Do You will work across multiple client environments with different technologies, configurations and business requirements. Your responsibilities will include: Own the investigation and resolution of complex infrastructure incidents and escalations. Administer and troubleshoot Windows Server, Active Directory, Group Policy, DNS and DHCP. Support Microsoft 365 and Entra ID environments, including identity, authentication, MFA and Conditional Access. Troubleshoot and support virtualization environments using VMware and/or Hyper-V. Diagnose networking issues involving firewalls, VPNs, VLANs, routing, switching and connectivity. Support backup, disaster recovery and business continuity systems. Plan and execute infrastructure migrations, upgrades and modernization projects. Perform root-cause analysis and implement or recommend changes that prevent recurring problems. Use PowerShell, scripting, automation and other tools where they can improve reliability and efficiency. Create and maintain clear technical documentation. Work directly with clients, vendors and other GEM engineers during projects and technical incidents. Provide occasional onsite support at client locations in the New York City metropolitan area. What We're Looking For We care more about demonstrated technical depth, troubleshooting ability and ownership than a perfect list of certifications or products on a resume. Strong candidates will have substantial hands-on experience supporting production IT infrastructure and personally resolving complex technical problems. You should have strong experience in most of these areas: Microsoft Infrastructure Windows Server and Active Directory Group Policy, DNS and DHCP Microsoft 365 and Entra ID Identity, MFA and Conditional Access Virtualization and Core Infrastructure VMware vSphere/ESXi and/or Microsoft Hyper-V Server and storage infrastructure Backup and disaster…