M365 Platform Engineer

Maximus TCS (Technology and Consulting Services) Internal Job Profile Code: TCS135, T3, Band 6

Job-Specific Essential Duties and Responsibilities:

- Provide Tier-3 engineering support for Microsoft 365 GCC, Exchange Online, hybrid Exchange Server, and SharePoint Online environments, ensuring platform availability, performance, and security.

- Manage, monitor, restore, and optimize enterprise email and messaging services, including mailbox services, transport, retention, and e-discovery capabilities.

- Support SharePoint Online platform operations, including site collections, permissions, integrations, and collaboration workloads aligned with enterprise messaging services.

- Plan, test, execute, and support upgrades, patches, and migrations across cloud and hybrid environments while minimizing user impact and service disruption.

- Perform break-fix restoration, root cause analysis, and complex incident resolution in coordination with incident management and cybersecurity teams.

- Support the segregation and elimination of malicious software and spam traffic in accordance with security policies and directives.

- Develop and maintain technical documentation, standard operating procedures, and platform diagrams.

Job-Specific Minimum Requirements:

- Bachelor's degree in Information Technology, Computer Science, or a related field or equivalent years of relevant experience.

- 5+ years supporting Microsoft enterprise collaboration platforms, including Microsoft 365, Exchange, and/or SharePoint in cloud or hybrid environments.

- Demonstrated experience administering Microsoft 365 (Government or Commercial) environments, including Exchange Online and hybrid Exchange Server, supporting large enterprise user populations (10,000+ users).

- Hands-on experience providing Tier-3 engineering support, including complex incident resolution, root cause analysis, service restoration, and execution of approved changes in production cloud and hybrid environments.

- Experience administering SharePoint Online, including site collections, permissions, governance controls, and integration with Microsoft 365 collaboration services.

- Experience planning and executing upgrades, patches, and migrations for enterprise messaging and collaboration platforms.

- Working knowledge of email security and malware mitigation, including spam filtering, malicious content isolation, and alignment with cybersecurity policies and NIST SP 800-53 controls.

- Ability to obtain and maintain a Public Trust (or higher) clearance.

Preferred Skills and Qualifications:

- Microsoft 365 certification

- Hands-on experience with Microsoft 365 GCC or other regulated government cloud environments.

- Experience supporting large-scale hybrid Exchange deployments.

- Strong understanding of email security, spam filtering, and malware mitigation.

- Experience with SharePoint Online administration and integration with Teams and Exchange.

- Familiarity with ServiceNow or similar ITSM ...