M365 Messaging Lead

About the role

As an M365 Messaging Lead
, you will make an impact by ensuring the reliability, security, and governance of our enterprise messaging environment. You will oversee the secure and uninterrupted flow of millions of emails each day, enhance collaboration through Microsoft Teams, and strengthen the organization’s overall compliance and security posture. This role blends hands-on technical expertise with leadership, giving you the opportunity to shape messaging architecture, drive operational excellence, and mentor junior engineers.

You will be a valued member of the Cloud Infrastructure and Security team and work collaboratively with the Senior Manager.

• Oversee daily operations of Exchange Online and hybrid messaging services, ensuring secure mail flow, high availability, and optimal performance.
• Manage mail flow, transport rules, connectors, mailbox policies, shared mailboxes, distribution groups, and permissions.
• Monitor message traces, queues, and service health, leading incident response and root cause analysis (RCA) for messaging issues.
• Administer and optimize Proofpoint (POD/TRAP/TAP/EOP) for anti-spam/anti-phishing protections, URL defense, and attachment sandboxing.
• Maintain and enhance DMARC/DKIM/SPF configurations, manage quarantines and sender lists, and lead campaign-level threat investigations.
• Administer M365 Security & Compliance features including DLP, retention policies, litigation hold, eDiscovery, Safe Links, and Safe Attachments.
• Enforce RBAC, least privilege, configuration baselines, and change control procedures across messaging and collaboration platforms.
• Maintain Active Directory / Entra , including service accounts, groups, policies affecting Outlook/Teams, and directory sync/health.
• Support identity lifecycle processes, Conditional Access, and app registrations related to messaging services.
• Manage Microsoft Teams policies, guest access, channels, and collaboration governance.
• Partner with infrastructure, security, and business teams to align messaging services with organizational goals.
• Develop and maintain technical documentation, runbooks, and operational standards.
• Identify and implement opportunities for improved reliability, scalability, and user experience through automation and continuous improvement.
• Mentor junior engineers and champion best practices for secure and compliant messaging operations.

We strive to provide flexibility wherever possible. Based on this role’s business requirements, this is a remote position open to qualified applicants in San Francisco, CA. Regardless of your working arrangement, we are here to support a healthy work-life balance though our various wellbeing programs.

The working arrangements for this role are accurate as of the date of posting. This may change based on the project you’re engaged in, as well as business and client requirements. Rest assured; we will always be clear about role expectations.

• Extensive experience administering Exchange Online and enterprise messaging environments.
• Strong background supporting Hybrid Exchange (mail flow, connectors, transport rules).
• Proven expertise with M365 messaging migrations.
• Hands-on experience with Proofpoint administration and tuning.
• Knowledge of M365 Security & Compliance features (DLP, retention, eDiscovery, litigation hold).
• Strong troubleshooting skills with the ability to lead incidents, conduct RCA, and implement durable fixes.
• Experience supporting hybrid work models and rotational shift schedules.
• Proficiency maintaining Active Directory and Entra  supporting identity lifecycle/Conditional Access.
• Experience administering Microsoft Teams policies and governance.
• Excellent communication skills and cross-functional collaboration capabilities.
• Bachelor’s degree in Computer Science, Engineering, or equivalent experience.

• Power Shell scripting and automation for Exchange/M365 operations.
• Experience with Microsoft Defender for Office 365 and advanced email threat protection.
• Familiarity with Teams Voice/telephony administration.
• Experience developing runbooks, monitoring dashboards, and…