Senior Microsoft 365 & SharePoint Architect

SEAN GERLINGER

Little Elm, Texas • 469-***-**** • *********@****.***

PROFESSIONAL SUMMARY

Senior Cloud Solution Architect and Microsoft enterprise systems engineer with 20+ years of experience designing, administering, modernizing, and supporting mission-critical Microsoft environments. Deep expertise across Microsoft 365, SharePoint, Entra ID, identity and access management, security, governance, PowerShell automation, enterprise infrastructure, and high-severity incident resolution. Proven technical leader experienced in translating complex business requirements into scalable solutions, mentoring engineers, and advising enterprise stakeholders in highly regulated environments.

CORE EXPERTISE

Microsoft 365 Administration

SharePoint Online & Server

Advanced PowerShell scripting

Entra Conditional Access Policies

Entra ID / AD FS / SAML / OIDC

Copilot Studio / Azure AI Foundry

Document Management & Governance

Root-Cause Analysis & Incident Command

Purview / Sensitivity Labels / Information Barriers

PowerApps and PowerAutomate

Performance & Capacity Planning

Backup / Recovery / Resiliency

Microsoft Graph & App Authentication

Microsoft Hyper-V

Entra Application Proxy

Entra Connect Sync

Engineer Mentoring & Training

PROFESSIONAL EXPERIENCE

Senior Cloud Solution Architect Microsoft Apr 2022 – Sep 2026

Irving, TX

Served as a Senior Cloud Solution Architect and trusted technical advisor for large enterprise and highly regulated customers, providing architecture, modernization, security, troubleshooting, and operational guidance across Microsoft 365, SharePoint Online, SharePoint Server(2013,2016,2019,SE), OneDrive, and Microsoft Entra ID.

Designed and evaluated enterprise SharePoint and Microsoft 365 architectures spanning information architecture, document management, permissions, governance, authentication, security, storage, performance, resiliency, disaster recovery, and lifecycle management.

Led complex SharePoint modernization and migration initiatives, including SharePoint Server-to-SharePoint Online migrations, SharePoint 2019-to-Subscription Edition modernization, legacy workflow retirement, document-management modernization, storage optimization, and migration from unsupported platforms.

Designed and validated SharePoint Subscription Edition proofs of concept, reproducing production architectures to test farm topology, service applications, authentication, security requirements, integrations, migration approaches, and platform supportability prior to production deployment.

Designed, implemented, and troubleshot enterprise identity and federation solutions integrating Microsoft Entra ID, AD FS, Okta, Ping Identity, and SiteMinder using SAML, OpenID Connect (OIDC), WS-Federation, claims-based authentication, and certificate-based authentication.

Designed, configured, and managed Microsoft Entra Conditional Access Policies, including user and group targeting, application access, MFA requirements, device and location conditions, grant and session controls, policy exclusions, testing, troubleshooting, and secure access enforcement.

Configured and supported Microsoft Entra Application Proxy to securely publish on-premises applications, including connector deployment, application configuration, authentication, access controls, and integration with Entra ID and Conditional Access.

Implemented and advised on Microsoft 365 information-protection and compliance capabilities including Microsoft Purview Sensitivity Labels, Information Barriers, permissions governance, access controls, and data-protection strategies.

Developed advanced PowerShell automation for administration, health checks, migration readiness, reporting, security validation, governance, version management, storage optimization, bulk diagnostics, troubleshooting, and repeatable enterprise operational processes.

Led mission-critical incident response and high-severity investigations, serving in incident-command and escalation roles while coordinating Microsoft Support, Product Engineering, account teams, service owners, and customer engineering teams through service restoration and root-cause remediation.

Diagnosed and resolved complex enterprise issues involving authentication, claims, SAML/OIDC, Entra ID, AD FS, People Picker, certificates, load balancers, SNI, reverse proxies, IIS, networking, caching, Search, patch compatibility, performance, and SharePoint service architecture.

Designed secure Microsoft 365 integration solutions using Microsoft Graph, Entra application registrations, service principals, API permissions, and certificate-based application authentication to enable controlled programmatic access to SharePoint Online and Microsoft 365 services.

Partnered with customer executives, security teams, engineering leadership, business stakeholders, and Microsoft account teams to conduct architecture assessments, gather requirements, identify technical risk, and translate business objectives into scalable cloud and hybrid solutions.

Designed and built Microsoft Copilot Studio agents and next-generation SharePoint Copilot Apps, applying emerging Microsoft 365 Copilot extensibility to create interactive, enterprise-grounded experiences integrated with SharePoint content and services.

SharePoint Senior Support Escalation Engineer Microsoft Mar 2012 – Apr 2022

Irving, TX

Served as a senior SharePoint subject-matter expert and primary technical escalation contact for Fortune 500 and enterprise customers across SharePoint Server, SharePoint Online, Microsoft 365, and hybrid environments.

Delivered advanced troubleshooting, incident recovery, and root-cause analysis for complex production issues spanning SharePoint farm architecture, web applications, service applications, IIS, SQL dependencies, networking, permissions, Search, performance, availability, and disaster-recovery environments.

Diagnosed and resolved complex identity and authentication issues involving Microsoft Entra ID, Active Directory, AD FS, Claims-based authentication, SAML, Kerberos, Forms-Based Authentication, certificates, and SharePoint hybrid configurations.

Developed advanced PowerShell automation for SharePoint administration, farm health validation, bulk diagnostics, data collection, troubleshooting, web-application deployment, infrastructure testing, and repeatable support workflows.

Served as a SharePoint 2019 and Subscription Edition Product Beta Engineer, working directly with Microsoft Product Engineering to evaluate pre-release builds, investigate defects, validate fixes, identify supportability issues, and improve product readiness and release quality.

Partnered with Microsoft Engineering through the Technology Adoption Program (TAP) to reproduce customer and beta issues, communicate technical findings and customer impact, validate product changes, and provide engineering feedback throughout the development lifecycle.

Developed and delivered SharePoint 2019 and Subscription Edition Beta Talks, Brown Bag sessions, technical readiness content, and global support training, helping prepare Microsoft engineers to support new SharePoint releases and technologies.

Authored and presented “Troubleshooting SharePoint Hybrid” at Microsoft Ready 2019 in Seattle, providing advanced guidance on diagnosing SharePoint Server, SharePoint Online, authentication, identity, and hybrid connectivity issues.

Performed proactive technical assessments and advised customers on SharePoint farm performance, capacity planning, high availability, disaster recovery, backup/recovery, infrastructure design, operational health, and incident prevention.

Troubleshot complex SharePoint permissions and access-control issues, including site collection permissions, security groups, broken inheritance, access requests, service accounts, authentication failures, and authorization behavior.

Investigated complex SharePoint integration and application issues involving REST APIs, web services, custom solutions, workflows, IIS, networking, certificates, and application dependencies, using deep diagnostic and tracing techniques.

Used advanced diagnostic tools including Fiddler, Wireshark / network tracing, Procmon, DebugDiag, ULS logs, Windows Event Logs, IIS logs, and PowerShell to isolate failures across application, operating-system, authentication, and network layers.

Partnered with Microsoft Product Engineering and support teams to reproduce product defects, validate hotfixes and cumulative updates, test remediation strategies, identify regressions, and provide product-improvement recommendations.

Created technical documentation, troubleshooting procedures, reusable diagnostics, and support best practices that improved case consistency, engineer efficiency, knowledge transfer, and support readiness across Microsoft support teams.

Mentored Microsoft support engineers and delivered technical workshops, readiness sessions, proactive health reviews, and one-on-one technical guidance covering SharePoint architecture, troubleshooting, authentication, PowerShell, performance, capacity, resiliency, and supportability.

Senior SharePoint Engineer Bank of America Aug 2005 – Mar 2012

Plano, TX

Served as a Senior SharePoint Engineer and technical lead for enterprise MOSS 2007 and SharePoint 2010 environments spanning 100+ servers across DEV, TEST, PROD, and DR.

Led and provided technical direction to a 5-person offshore support team responsible for SharePoint administration, monitoring, maintenance, troubleshooting, and incident escalation.

Supported mission-critical SharePoint environments within a highly regulated global financial-services organization, maintaining strong security, governance, access controls, change management, availability, and business continuity.

Designed and administered enterprise SharePoint solutions including site collections, web applications, lists, document libraries, information architecture, permissions, security groups, metadata, and document-management capabilities.

Led large-scale SharePoint migrations supporting the Countrywide and Merrill Lynch acquisitions, coordinating infrastructure teams, application owners, migration planning, backup/recovery, validation, production cutover, and continuity requirements.

Managed the full SharePoint administration lifecycle, including farm provisioning, configuration, solution deployment, backup/restore, patching, performance monitoring, capacity planning, disaster recovery, and Level 2/3 escalation support.

Performed advanced troubleshooting and root-cause analysis across SharePoint, IIS, Windows Server, SQL dependencies, authentication, networking, performance, and application infrastructure.

Managed enterprise permissions, security groups, service accounts, and access controls, ensuring alignment with corporate security, compliance, and governance standards.

Authored operational documentation and delivered training and mentoring for offshore engineers, Level 2 support teams, site owners, and end users to improve support efficiency, platform adoption, and self-service capabilities.

Network Support Engineer III Microsoft (via CompconTech) Jul 2004 – Aug 2005

Irving, TX

Provided advanced network and infrastructure support for Microsoft Premier enterprise customers, troubleshooting complex connectivity, authentication, and remote-access issues using CCNA-level networking and OSI-model expertise.

Diagnosed high-severity failures across TCP/IP, SMB, DNS, DHCP, WINS, RRAS, VPN, NAT, RDP, IAS, and wired/wireless enterprise networks.

Performed deep packet, protocol, routing, firewall, name-resolution, and application-layer analysis using Microsoft Network Monitor, Wireshark, Fiddler, Telnet, and remote diagnostic tools.

Configured and enterprise-tested Alteon and F5 BIG-IP load balancers to support high availability, traffic distribution, resiliency, and business continuity.

Delivered remote technical support and root-cause troubleshooting across complex enterprise network environments, helping customers restore service and isolate infrastructure failures.

CERTIFICATIONS & MICROSOFT EXAMS

Microsoft Certified: Azure AI Fundamentals (AI-900) Jun 2026

Advanced Solutions of Microsoft SharePoint Server 2013 (332) May 2017

Core Solutions of Microsoft SharePoint Server 2013 (331) Feb 2017

Enabling Office 365 Services (347) May 2016

Managing Office 365 Identities and Requirements (346) Feb 2015

PRO: Microsoft SharePoint 2010, Administrator (668) Apr 2014

TS: Microsoft SharePoint 2010, Configuring (667) Mar 2013

Designing Security for a Microsoft Windows 2000 Network (220) May 2005

Implementing and Administering a Microsoft Windows 2000 (217) May 2005

Network Infrastructure (216) Apr 2005

Managing a Windows 2000 Network Environment (218) Aug 2003

Designing and Deploying a Messaging Infrastructure with Microsoft Exchange 2000 Server (225) Apr 2003

Installing, Configuring, and Administering Microsoft Exchange 2000 Server (224) Apr 2003

Installing, Configuring, and Administering Microsoft Windows 2000 Server (215) Mar 2003

Installing, Configuring, and Administering Microsoft Windows 2000 Professional (210) Oct 2001

EDUCATION

Associate of Applied Science, Electronics Southern Technical College – Little Rock, AR Sept 1986 – May 1988

High School Diploma North Pulaski High School – Jacksonville, AR May 1986

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