Senior On-Premises Exchange & Messaging Infrastructure SME (Contract)
GEM Technologies · TELECOMMUTE · Posted Jul 7, 2026
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About GEM Technologies
GEM Technologies is a cybersecurity-focused Managed Services Provider (MSP) supporting organizations that depend on secure, reliable, and highly available technology infrastructure.
We are seeking a Senior On-Premises Exchange & Messaging Infrastructure Subject Matter Expert (SME) to join our team as a long-term independent contractor.
This role is designed for an expert who enjoys solving complex technical challenges, mentoring experienced engineers, and serving as a trusted advisor for architecture, escalated production issues, and advanced troubleshooting. It is not a help desk position or a role for someone whose experience is limited to routine Exchange administration.
What You'll Do
As our Senior On-Premises Exchange & Messaging Infrastructure SME, you will provide expert guidance on complex on-premises Microsoft Exchange Server environments while working alongside our engineering team.
Your responsibilities will include:
Troubleshooting complex Exchange production issues and providing architectural guidance.
Large-scale enterprise messaging environments
Supporting upgrades, migrations, disaster recovery, performance optimization, and Exchange Hybrid deployments.
Supporting Exchange environments utilizing Citrix NetScaler (ADC) and Citrix CVAD.
Mentoring our engineers through collaborative troubleshooting and knowledge transfer.
Recommending best practices for security, reliability, and performance.
Creating technical documentation and participating in scheduled maintenance or critical production support when needed.
Required Technical Expertise
Candidates must have extensive, hands-on experience with on-premises Microsoft Exchange Server and related infrastructure, including:
Microsoft Exchange Server 2013, 2016, 2019, and Subscription Edition
Exchange Hybrid with Microsoft 365
DAGs, mail flow, transport services, Autodiscover, certificates, SMTP, DNS, SPF, DKIM, and DMARC
Active Directory, Windows Server, Group Policy, PowerShell, Microsoft Entra ID, and Azure AD Connect
High availability, disaster recovery, and Exchange security hardening
Citrix NetScaler (ADC), including Exchange publishing, reverse proxy, SSL offloading, and load balancing
Citrix CVAD administration and troubleshooting
VMware or Hyper-V
This position is focused on on-premises Microsoft Exchange Server. Candidates whose experience is primarily limited to Exchange Online or Microsoft 365 administration without significant on-prem Exchange experience are not likely to be a good fit.
Engagement Details
Independent contractor position
Remote within the United States
Long-term consulting relationship
Flexible workload based on client demand
Hourly Contract Rate
$100–$150 per hour, based on experience, technical expertise, certifications, interview performance, and the complexity of the engagement.