M365 Platform Engineer

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.

• 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.

• 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 Service Now or similar ITSM platforms.
• Experience operating in a 24x7x365 enterprise operations environment.

Maximus is an equal opportunity employer. We evaluate qualified applicants without regard to race, color, religion, sex, age, national origin, disability, veteran status, genetic information, and other legally protected characteristics.

Maximus provides reasonable accommodations to individuals requiring assistance during any phase of the employment process due to a disability, medical condition, or physical or mental impairment. If you require assistance at any stage of the employment process—including accessing job postings, completing assessments, or participating in interviews—please contact People Operations at

Annual salary ranges from $80,000.00 to $. Maximus compensation is based on various factors including job location, education, training, experience, expected quality and quantity of work, required travel, external market and internal value analysis, seniority, and merit systems. Other rewards may include short‑ and long‑term incentives and program‑specific awards. Maximus provides a variety of benefits, including health insurance coverage, life and disability insurance, a retirement savings plan, paid holidays, and paid time off.