Sr Systems Engineer

Senior Systems Engineer - Collaboration We are Lennar  Lennar is one of the nation's leading homebuilders, dedicated to making an impact and creating an extraordinary experience for their Homeowners, Communities, and Associates by building quality homes and providing exceptional customer service, giving back to the communities in which we work and live in, and fostering a culture of opportunity and growth for our Associates throughout their career.

Lennar has been recognized as a Fortune 500® company and consistently ranked among the top homebuilders in the United States.   A Career that Empowers You to Build Your Future The Senior Collaboration Engineer is responsible for the planning, implementation, administration, and support of diverse enterprise collaboration platforms, which serve over 12,000 geographically distributed endpoints (Windows, macOS, iOS, Android, and other devices).

This role combines advanced systems engineering expertise with deep knowledge of collaboration tools to ensure seamless communication, security, and productivity for the enterprise. The Senior Collaboration Engineer will serve as a technical leader, mentor, and subject matter expert for collaboration services.   Your Responsibilities on the Team Lead the deployment, configuration, management, and ongoing optimization of enterprise messaging and collaboration platforms, including Microsoft Teams, Microsoft Exchange Online, Purview, SharePoint, One Drive, Zoom, Box, and other collaboration tools.

Apply expertise across Microsoft 365 to maintain scalable solutions, resolve complex technical challenges, and drive continuous improvement across the collaboration ecosystem. Provide day-to-day administration, proactive troubleshooting, and lifecycle maintenance of Microsoft 365 applications, ensuring optimal performance and user experience. Ensure high availability, performance, regulatory compliance, and security across all collaboration systems, aligning with enterprise standards and audit requirements. Lead integration projects with IT and business stakeholders to streamline communication workflows, reduce friction, and enable seamless cross-platform collaboration.

Develop and maintain comprehensive system documentation, runbooks, standard operating procedures, and engineering best practices. Administer and maintain on-premises Active Directory environments, including user and group management, Group Policy Objects (GPOs), organizational unit (OU) structures, and domain trust configurations. Manage and optimize Azure Active Directory (Entra ), including hybrid identity configurations, Conditional Access policies, role-based access control (RBAC), and integration with Microsoft 365 services.

Oversee directory synchronization processes (Azure AD Connect / Entra Connect), ensuring clean, consistent identity data on-premises AD and cloud environments. Support identity governance initiatives including access reviews, privileged identity management (PIM), and lifecycle workflows for joiner, mover, and leaver processes. Troubleshoot and resolve complex identity and authentication issues, including SSO, MFA, and federation challenges across hybrid environments. Serve as the primary administrator and subject matter expert for enterprise AI tools, including Claude (Anthropic) and ChatGPT Enterprise, overseeing licensing, configuration, user provisioning, and policy management.

Partner with network engineering, application teams, security, and business units to design and implement solutions aligned with corporate objectives and enterprise architecture standards. Translate complex business requirements into scalable, reliable technical solutions, applying industry best practices and creative problem-solving. Mentor and coach junior engineers and technical staff on collaboration platforms, Active Directory, M365, and systems engineering best practices, fostering a culture of continuous learning.

Serve as a senior technical resource for project planning, platform integrations, and high-priority troubleshooting escalations. Research and evaluate emerging technologies across collaboration, AI, identity, and endpoint…