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

> GEM Technologies · United States (Remote) · Contract · Posted 2026-07-07

**Workplace:** remote

**Department:** New York

## Description

**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.

## Requirements

**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.

## Benefits

**Compensation:** $100–$150 per hour depending on experience and certifications. Final rate will depend on experience, certifications, and scope of engagement.

## Apply

[Apply at GEM Technologies](https://apply.workable.com/gemtechnologies/j/3D811C18F9/apply)

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