O365 Messaging Senior Engineer

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Job Summary 

We have an exciting opening for a Senior O365 Messaging Engineer to join our global IT team and support the delivery of O365 messaging solutions for our clients and internal stakeholders. You will be responsible for supporting the global O365 messaging service, ensuring its availability, performance, security, and compliance. You will have responsibility to work with our third-party resources, ensuring they meet service level agreements and quality standards. You will support messaging projects, such as tenant migrations, client transitions, and integration work including cross-tenant coexistence. You will provide guidance on messaging design and implementation. And you will act as a point of escalation for support related issues for troubleshooting O365 messaging features and integrations.  

Key Responsibilities 

• Support administration and management of the O365 messaging infrastructure, including both Exchange Online and on-premises environments, to ensure availability and performance. 

• Provide technical expertise and guidance in O365 messaging, primarily focused on Exchange. 

• Responsible for Proofpoint and Defender configuration and internal alignment on best practice operations. 

• Assist with regular management reporting and provide telemetry to track service health and progress against operational goals. 

• Work with third-party providers to ensure O365 messaging services are delivered in alignment with service level agreements and quality expectations. 

• Support cost optimization efforts and help manage the O365 messaging budget in line with organizational targets. 

• Ensure the messaging infrastructure is maintained according to business requirements, industry standards, and best practices. 

• Follow and enforce O365 messaging policies, procedures, and governance frameworks. 

• Troubleshoot and resolve complex or escalated O365 messaging incidents, problems, changes, and requests, acting as an escalation point for support issues. 

• Provide technical support and guidance to end users and stakeholders for O365 messaging-related issues. 

• Participate in O365 messaging projects and initiatives, such as tenant migrations, integrations, and service improvements, from planning through to execution. 

• Creates, tests and manages scripts as needed for management and administration 

• Performs other duties as assigned/required 

• Attend Project and management meetings, communicating with technical and non-technical staff at all levels. 

Qualifications and Requirements 

• Bachelor's degree in Computer Science, Information Technology, or related field. 

• At least 7 years of experience in O365 messaging engineering and administration. 

• Strong knowledge of Exchange Online (Microsoft 365) administration and hybrid Exchange deployments including Microsoft Exchange Server (2016/2019) architecture, installation, and upgrades 

• Strong knowledge of mail flow design, connectors, transport rules, and routing  

• Expert knowledge of Microsoft Defender for Office 365 , Microsoft Purview Suite and Proofpoint including Mail Protection, TAP, EFD, threat analysis, eDiscovery, retention, DLP & Legal hold processes 

• Strong knowledge and skills in O365 Email security (anti-spam, anti-malware, phishing protection), role-based access control (RBAC), TLS, certificates 

• Strong knowledge of email transport security including DMARC, DKIM, SPF and how these can effect mail delivery 

• Experience with cross‑tenant migrations and coexistence strategies including integration with third‑party email security, archiving & Migration tools (e.g MigrationWiz, AvePoint Fly, Quest QMM) 

• Experience with Intune - Mobile Device Management, including understanding of ABM, Google Enterprise, Compliance , Configuration and App protection policies 

• Knowledge of Teams, SharePoint, and OneDrive dependencies on Exchange 

• Knowledge of capacity planning, performance tuning and patch management 

• Experience with monitoring tools and alerting (Microsoft and third‑party) 

• Strong Scripting skills i.e PowerShell (Exchange, Microsoft 365, Azure AD modules) 

• Strong communication, collaboration and stakeholder management skills, both verbal and written. 

• Strong analytical, troubleshooting and critical thinking skills using logs, message traces, and PowerShell diagnostics 

• Preference will be given to candidates who have one or more of the following Microsoft certifications: Microsoft 365 Certified: Messaging Administrator Associate, Microsoft 365 Certified: Enterprise Administrator Expert, or Microsoft 365 Certified: Teams Administrator Associate.  

Location:

If this job description resonates with you, we encourage you to apply even if you don’t meet all of the requirements.  We’re interested in getting to know you and what you bring to the table!

At JLL, we harness the power of artificial intelligence (AI) to efficiently accelerate meaningful connections between candidates and opportunities. Using AI capabilities, we analyze your application for relevant skills, experiences, and qualifications to generate valuable insights about how your unique profile aligns with the specific requirements of the role you're pursuing.

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Jones Lang LaSalle (“JLL”) is an Equal Opportunity Employer and is committed to working with and providing reasonable accommodations to individuals with disabilities.  If you need a reasonable accommodation because of a disability for any part of the employment process – including the online application and/or overall selection process –  you may email us at HRSCLeaves@jll.com. This email is only to request an accommodation. Please direct any other general recruiting inquiries to our Contact Us page > I want to work for JLL.

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