Job#: 3030521 Job Description: Department: Unified Communications / Infrastructure
Reports to: Senior Manager, Unified Communications
Position SummaryOur client is seeking an experienced
Senior Microsoft Exchange Engineer to provide expert-level engineering, administration, and troubleshooting across complex
Exchange on-premises, Exchange Online, and hybrid messaging environments. This role is critical due to the upcoming retirement of a senior SME, requiring immediate onboarding for
knowledge transfer, documentation, and operational continuity.
The ideal candidate will function as the highest-tier technical escalation point, lead advanced incident resolution, and ensure secure, compliant messaging architecture. This position offers a
contract-to-hire path and an opportunity to shape modernization strategies for enterprise messaging.
Key ResponsibilitiesExchange Administration & Engineering- Design, configure, and maintain Exchange Server 2013/2016/2019 environments.
- Manage Exchange Online configuration, scaling, and optimization.
- Support and enhance Hybrid Exchange architectures (OAuth, hybrid mail flow, connectors, federation).
- Administer and troubleshoot:
- DAGs and database replication
- Transport services and mail routing
- Autodiscover, EWS, MAPI/HTTP, ActiveSync
- Certificates, namespaces, and load balancing
Migration & Knowledge Transfer- Lead migrations from on-prem Exchange to Exchange Online (M365) via hybrid, cutover, staged, or third-party tools.
- Conduct mailbox migrations, PST ingestion, public folder migrations, and identity sync tasks.
- Document existing environment and processes for future reference.
- Collaborate with retiring SME for seamless knowledge transfer.
Security, Compliance & Governance- Manage and optimize:
- Exchange Online Protection (EOP)
- Microsoft Defender for Office 365
- Anti-spam/anti-malware policies
- DLP and retention policies
- Investigate email spoofing, phishing, and transport anomalies.
PowerShell & Automation- Develop and maintain advanced PowerShell scripts for automation, reporting, and health monitoring.
- Build self-service capabilities where appropriate.
Monitoring & Troubleshooting- Serve as Tier 3 escalation for complex issues.
- Troubleshoot hybrid mail flow, OAuth failures, Autodiscover issues, and performance anomalies.
- Engage Microsoft Premier/Unified Support as needed.
Identity & Integration- Strong knowledge of:
- Azure AD Connect / cloud sync
- Conditional Access
- Authentication flows (Modern Auth, OAuth)
- Understand downstream integrations (Teams, MDM, security tooling).
Required Skills & Qualifications- 7-10+ years administering Exchange on-prem and Exchange Online at enterprise scale.
- Deep expertise in:
- Exchange Server 2013/2016/2019
- Exchange Online administration & PowerShell
- Hybrid configuration (HCW), mail flow, connectors
- DAG architecture and failover
- SMTP routing and transport rules
- Expert-level PowerShell scripting (complex modules, automation).
- Strong troubleshooting skills for mail flow, hybrid auth, DAG replication, DNS/cert issues.
- Familiarity with tools like RCA, Message Trace, Service Health Dashboard.
- Excellent documentation and communication skills.
Preferred Qualifications- Microsoft certifications:
- MS-203 (Messaging Administrator Associate)
- AZ-104 (Azure Administrator)
- Legacy MCSE/MCSA in messaging
- Experience with:
- Third-party migration tools (Quest, BitTitan)
- Advanced M365 governance
- Mobile device management (Intune, Workspace ONE)
- Teams integration with Exchange Online
Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click for more details.
Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide.
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