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The Senior Systems & Network Engineer (L3) serves as the highest technical escalation point for complex infrastructure, cloud, network, and security issues across multiple client environments. This role is responsible for designing, implementing, optimizing, and supporting enterprise-grade IT infrastructure while ensuring high availability, security, scalability, and operational excellence. As an L3 Engineer, you will lead complex troubleshooting efforts, perform deep root cause analysis (RCA), and drive long-term solutions rather than temporary fixes. You will collaborate with internal engineering teams, mentor junior engineers, and participate in infrastructure modernization projects involving Microsoft 365, Azure, VMware, networking, cybersecurity, disaster recovery, and automation. This role requires exceptional technical expertise, strong analytical skills, and the ability to manage multiple enterprise environments within a Managed Service Provider (MSP) setting. Key Responsibilities Infrastructure Engineering Design, implement, and maintain enterprise Windows Server environments (2012–2025). Architect and manage Active Directory, Azure Active Directory (Entra ID), DNS, DHCP, DFS, PKI, Certificate Services, File Services, and Group Policy. Design and administer hybrid Microsoft 365 and Azure environments. Plan and execute infrastructure upgrades, migrations, consolidations, and modernization projects. Perform capacity planning, performance tuning, and infrastructure optimization. Enterprise Networking Design, deploy, and troubleshoot enterprise LAN, WAN, SD-WAN, VLANs, VPNs, routing, switching, wireless networks, and high-availability architectures. Configure and support Cisco, Meraki, SonicWall, Fortinet, Palo Alto, Ubiquiti, and similar enterprise networking platforms. Troubleshoot complex routing protocols, VPN tunnels, firewall policies, NAT, ACLs, QoS, and network segmentation. Support multi-site and Site-to-Site VPN environments. Microsoft Technologies Administer Microsoft 365, Exchange Online, SharePoint Online, Teams, OneDrive, Defender, and Intune. Design Conditional Access policies, MFA, Autopilot deployments, compliance policies, and endpoint security. Perform advanced Exchange administration, including hybrid Exchange environments. Design and manage enterprise Group Policy Objects (GPOs) and security baselines. Virtualization & Cloud Design and administer VMware vSphere, ESXi, vCenter, Hyper-V, and clustered virtualization environments. Manage storage, snapshots, HA, DRS, vMotion, replication, and virtual networking. Design and support Microsoft Azure infrastructure, including virtual networks, virtual machines, storage, identity, backup, monitoring, and governance. Support cloud migration and hybrid cloud initiatives. Security & Compliance Implement Zero Trust security principles and identity management best practices. Configure Microsoft Defender, Sentinel, Azure Security Center, Conditional Access, and endpoint security solutions. Perform vulnerability assessments, security remediation, patch management, and hardening activities. Investigate security incidents and assist with incident response and remediation. Ensure compliance with industry standards and security best practices. Backup & Disaster Recovery Design and maintain backup and disaster recovery solutions using Veeam, Datto, Barracuda, Azure Backup, and similar technologies. Perform backup validation, recovery testing, replication monitoring, and disaster recovery planning. Conduct periodic recovery drills and document recovery procedures. Automation & Process Improvement Develop automation scripts using PowerShell and other scripting technologies. Improve operational efficiency through automation, standardization, and process optimization. Build documentation, knowledge base articles, SOPs, and infrastructure standards. Identify recurring issues and implement permane