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

GEM Technologies

1d • $100 - $150 • Remote

About The Position

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.

Requirements

• Extensive, hands-on experience with on-premises Microsoft Exchange Server and related infrastructure.
• 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.
• 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.
• 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.

Nice To Haves

• 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.

Responsibilities

• Provide expert guidance on complex on-premises Microsoft Exchange Server environments while working alongside our engineering team.
• Troubleshooting complex Exchange production issues and providing architectural guidance for 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.

Benefits

• Hourly Contract Rate: $100–$150 per hour, based on experience, technical expertise, certifications, interview performance, and the complexity of the engagement.

What This Job Offers

• Career Level: Senior
• Education Level: No Education Listed