M365 Cloud Engineer

About Harris

Harris is a leading provider of financial management and Customer Information Systems (CIS) software solutions serving Public Sector, Schools, Utilities, and Healthcare organizations across North America. Since 1976, Harris has built a reputation for delivering robust, feature-rich solutions and long-term customer partnerships.

Our Corporate IT team seeks an experienced Office 365 Engineer, with a strong emphasis on Exchange, Teams, and Active Directory (AD) identity management. This role is responsible for designing, implementing, and maintaining Exchange (on‑premises and hybrid), Teams, and Azure AD (Microsoft Entra ).

• Lead the design, configuration, and ongoing administration of Exchange Online within the Microsoft 365 tenant, including mailbox provisioning, shared/resource mailboxes, distribution groups, and Tenant-to-Tenant migration projects.
• Architect and manage end-to-end mail flow including send/receive connectors, transport rules, smart host relay, third‑party gateway integrations (e.g., Mimecast, Proofpoint), and DNS records (MX, SPF, DKIM, DMARC).
• Serve as the primary owner of Exchange Online Protection (EOP) and Microsoft Defender for Office 365, configuring and tuning anti‑phishing, anti‑spam, safe links, safe attachments, and protection policies.
• Act as the Tier 3/4 escalation point for all email‑related incidents including NDRs, mail flow failures, spoofing, BEC attacks, and malware delivery events, with full Root Cause Analysis (RCA) documentation.
• Design, deploy, and maintain Microsoft 365 DLP policies across Exchange Online, Teams, SharePoint, and One Drive in alignment with GDPR and HIPAA requirements, tuning conditions and exceptions to minimize false positives.
• Administer Microsoft Purview compliance solutions including retention policies, sensitivity labels, MRM, litigation holds, eDiscovery (Content Search and Premium), communication compliance, and insider risk management policies.
• Manage email authentication posture by continuously validating and enforcing SPF, DKIM, and DMARC configurations, reviewing Microsoft Secure Score recommendations.
• Develop and maintain Power Shell automation scripts for Exchange Online bulk operations, user lifecycle workflows (onboarding/offboarding), compliance reporting, and Microsoft Graph API integrations with ITSM or HRIS platforms.
• Follow ITIL and change management best practices for all platform changes — including raising RFCs, participating in Change Advisory Board (CAB) reviews, maintaining incident/problem records, and producing post‑implementation reviews (PIR) for major changes impacting Exchange, Teams, or voice environments.
• Administer Microsoft Teams — managing messaging, meeting, and app permission policies, Teams Rooms (MTR) devices, and providing Tier 2/3 escalation support for Teams incidents.
• Administer Entra  — identity management using Azure AD Connect, SSO technologies like SAML.
• Knowledge of Windows and Active Directory, TCP/IP, DHCP, DNS, etc.
• Administer Ring Central user provisioning and IVR.

• Experience with large‑scale Exchange migrations and tenant consolidations.
• Microsoft certifications (Exchange, Teams, Microsoft 365, or Azure).

Harris offers an extremely competitive UK employee benefits programme. Five Personal Days leave entitlement are granted over and above the standard 25 days holiday and bank holidays. Harris also offers all UK employees an annual Lifestyle Reward amounting £325 per annum (pro‑rata).

We are an equal opportunities employer.