Sr. MS Exchange Systems Engineer

Sr MS Exchange Systems Engineer

100% ONSITE in Washington DC

Per Federal contract U.S. Citizenship or green card Required

Must be able to pass enhanced background screen (criminal, financial, drug) for Public Trust clearance

Performance Period: 04/26 – 12/31/2026 with the possibility of extension.

W-2 or C2C

Must apply by March 19th

Position Requirements:

Exchange On-Premises Administration (20%)

• Manage and maintain Microsoft Exchange Server 2016/2019/SE infrastructure including mailbox databases, DAGs, and high availability
• Perform server maintenance, patching, certificate management, and capacity planning
• Troubleshoot mail flow issues, connectivity problems, and performance bottlenecks
• Configure transport rules, connectors, and Client Access Services
• Manage integration with Enterprise Vault for legacy archive access

Exchange Online Administration (20%)

• Administer Microsoft 365 Exchange Online environment and hybrid configuration
• Manage mailbox migrations from on-premises to Exchange Online
• Configure Exchange Online Protection (EOP), DLP policies, and mail flow rules
• Implement retention policies, eDiscovery, and compliance features
• Monitor service health and manage M365 compliance requirements
• Oversee migration from Enterprise Vault to M365 native archiving/retention

Microsoft Teams Administration (25%)

• Administer Teams environment including team/channel governance and lifecycle policies
• Configure Teams voice features including Direct Routing, calling policies, and phone system
• Manage Teams apps, bots, custom integrations, and connector policies
• Implement Teams compliance including retention, eDiscovery, communication compliance, and information barriers
• Configure guest access, external access, meeting policies, and live events
• Troubleshoot Teams connectivity, quality issues, and client problems
• Manage Teams device administration (phones, room systems, displays)

Email Security & Proofpoint Administration (15%)

• Administer Proofpoint Email Security platform and configure filtering policies
• Manage threat protection including TAP, URL Defense, and Attachment Defense
• Monitor and respond to security incidents and phishing campaigns
• Implement and maintain email authentication (DMARC, SPF, DKIM) and encryption
• Generate compliance and security reports

M365 Ecosystem & Power Platform Support (10%)

• Support Power Automate flows integrating with Exchange, Teams, and SharePoint
• Assist with Power Platform governance, DLP policies, and connector security
• Maintain integration points between SharePoint Online, OneDrive, and Teams
• Support automation solutions leveraging M365 services
• Understand licensing implications across M365 workloads

Automation & Scripting (10%)

• Develop and maintain PowerShell scripts for Exchange, Teams, and M365 automation
• Utilize Microsoft Graph API for advanced automation and reporting
• Create bulk operation scripts for user provisioning, migrations, and configuration changes
• Automate routine administrative tasks and reporting
• Document and maintain script libraries and automation workflows

Additional Duties

• Participate in on-call rotation to provide Tier 2 support for M365 Platform
• Provide Tier 3 support for escalated email and Teams issues
• Document configurations, maintain procedures, and train staff
• Collaborate with IT security and compliance teams on email and collaboration security initiatives
• Assist with M365 governance and adoption planning

Required Technology & Experience

Experience Requirements

• 3-5 years email and collaboration platform administration experience
• Microsoft Exchange Server (2016 or later) administration experience
• Exchange Online and Microsoft 365 administration experience
• Microsoft Teams administration experience
• Proven experience with hybrid Exchange environments and cloud migrations
• PowerShell scripting experience for automation and bulk operations
• Email security platform administration (Proofpoint preferred)

Preferred Qualifications

• Microsoft 365 Certified: Messaging Administrator Associate (MS-203)
• Microsoft 365 Certified: Teams Administrator Associate (MS-700)
• Microsoft Certified: Security, Compliance, and Identity Fundamentals (SC-900)
• Proofpoint Certified Administrator
• Experience with Enterprise Vault administration and EV-to-M365 migrations
• Experience with Power Platform (Power Automate, Power Apps)
• Knowledge of regulatory compliance frameworks (GDPR, HIPAA, SOX, etc.)
• Experience with Microsoft Teams voice/calling and Direct Routing
• GitHub/version control for script management

Desired Soft Skills

• Strong analytical and troubleshooting abilities
• Excellent documentation and communication skills
• Ability to work independently and manage multiple priorities
• Customer service orientation for end-user support
• Proactive approach to system monitoring and maintenance

Ref: #851-Rockville-S1

System One, and its subsidiaries including Joulé, ALTA IT Services, CM Access, TPGS, and MOUNTAIN, LTD., are leaders in delivering workforce solutions and integrated services across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible full-time employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.