Job Title: L3 Infrastructure Engineer Experience: 6+ Years Location: Remote Contract Type: Long Term Job Summary: We are seeking an experienced and proactive L3 Infrastructure Engineer to lead and resolve complex technical issues in a hosted Managed Service Provider (MSP) environment. The ideal candidate will have extensive hands-on experience with Citrix, RDS, VMware, Azure, and Windows Server environments, along with leadership capabilities to guide junior engineers. You will be responsible for advanced problem-solving, system optimization, and infrastructure enhancement projects while ensuring system stability, security, and performance. Key Responsibilities: Act as a technical escalation point for L2 and L1 teams across infrastructure platforms. Manage and troubleshoot complex Citrix Virtual Apps & Desktops, Citrix Cloud, Director, and StoreFront configurations. Lead Azure infrastructure management, migrations, and optimization tasks. Handle high-level Windows Server administration (2012/2016/2019/2022), including performance tuning and advanced configurations. Design, manage, and troubleshoot VMware vSphere and ESXi environments, including advanced VM operations. Manage backup infrastructure using Veeam Backup & Replication, ensuring recoverability and DR planning. Administer Active Directory, DNS, DHCP, GPOs, and NTFS permissions with an emphasis on security hardening. Oversee Exchange (Online & Hybrid) environments, Office 365 administration, and migration projects. Manage endpoint protection tools such as SentinelOne and Bitdefender, and oversee security policy implementation. Lead patch management, OS upgrades, and infrastructure maintenance initiatives. Conduct root cause analysis (RCA) for major incidents and drive permanent resolutions. Support Hosting Controller, anti-spam tools (e.g., SpamExperts), DUO MFA, and related security technologies. Collaborate with management to plan and implement infrastructure improvements. Maintain documentation of infrastructure, incidents, processes, and standard operating procedures. Provide guidance, mentoring, and training to L2 and L1 engineers. Required Technical Skills: Citrix XenApp/XenDesktop, Citrix Cloud, Director, Storefront (Advanced level) Microsoft Azure Administration and Infrastructure Projects Windows Server 2012/2016/2019/2022 (Advanced Administration) VMware ESXi, vSphere (Advanced troubleshooting, VM optimization) Office 365, Exchange Online, and hybrid configurations Veeam Backup & Replication (Backup strategies, DR planning) Active Directory, GPO, DNS, DHCP Endpoint Security Solutions: SentinelOne, Bitdefender Halo PSA (or equivalent ticketing system) NinjaRMM or similar monitoring tools DUO MFA, anti-spam filtering solutions SQL Server support and optimization (basic to intermediate level) Hosting Controller management Print server and network printer infrastructure support Preferred Qualifications: 6+ years of experience in L3 infrastructure support in an MSP or hosting environment Microsoft Certified: Azure Administrator Associate (AZ-104) Citrix Certified Professional (CCP-V) preferred VMware Certified Professional (VCP) MCSA / MCSE certifications ITIL v4 Foundation certification is an advantage Strong leadership, documentation, and communication skills Soft Skills & Attributes: Ability to handle critical incidents under pressure and drive resolution Strong analytical and problem-solving mindset Leadership and mentoring abilities Excellent client communication skills Strong team collaboration and task prioritization
Job Title
L3 Infrastructure Engineer