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# Senior On-Premises Exchange & Messaging Infrastructure SME (Contract)

- **Company:** GEM Technologies
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Salary:** $208,000.0 - $312,000.0
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Active Directory, Directed Acyclic Graph (Directed Graphs), Disaster Recovery, Domainkeys Identified Mail, Domain-Based Message Authentication Reporting and Conformance (DMARC), Domain Name System (DNS), Microsoft Exchange Server, Hyper-V, Simple Mail Transfer Protocols, Windows Servers, Citrix Systems, Performance Tuning, Windows PowerShell, Azure Active Directory, Reverse Proxy, Transport Layer Security, Load Balancing, System Availability, Sender Policy Framework (SPF), Citrix Netscaler, Vmware
- **Published:** July 9, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=e2a7e26590191732

## About the Role

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., Candidates must:

 * Be legally authorized to work in the United States.
 * Reside within the United States.
 * Demonstrate expert-level Microsoft Exchange knowledge during the interview process.
 * Be comfortable mentoring engineers and documenting solutions.
 * Communicate clearly and professionally with technical team members.

Preferred
*

 + Has worked for a Managed Services Provider or consulting firm
*

 + Comfortable being an advisor and teacher, not just a doer
*

 + Can quickly diagnose complex Exchange environments
*

 + Microsoft Exchange on prem experience
*

 + Can work independently and join calls when needed
*

 + Strong communication skills

Interview Process

Qualified candidates should expect a technical interview focused on real-world troubleshooting, Exchange architecture, disaster recovery, PowerShell, mail flow, hybrid deployments, load balancing, and related Microsoft infrastructure technologies.

We value practical experience and problem-solving ability over memorized interview answers or certifications alone.

## Description

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.


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