ACTIVE DIRECTORY ADMINISTRATOR RESUME EXAMPLE

Ethan Miller

Austin, TX

(512) 394-7812

ethan.miller.it@gmail.com

linkedin.com/in/ethanmiller-it

SUMMARY

Results-driven Active Directory Administrator with 1+ years of experience in Active Directory, Windows Server, and Identity Management within enterprise IT environments. Proven record of improving ticket resolution efficiency by 25% through structured troubleshooting and process adherence. Expertise in Group Policy and DNS Management to optimize system performance, mitigate access risks, and support secure infrastructure operations.

SKILLS

Active Directory

Windows Server

Group Policy

DNS DHCP

Identity Management

System Monitoring

EXPERIENCE

IT Support Administrator

Blue Ridge Systems Inc. – Austin, TX

June 2024 – Present

• Administered Active Directory user accounts and permissions for 2,000+ users, reducing access-related incidents by 20% through consistent policy enforcement.
• Resolved ServiceNow tickets and supported daily operations, achieving 95% SLA compliance and improving response time by 25%.
• Monitored Windows servers, DNS, and DHCP services, maintaining 99.8% uptime across infrastructure systems.
• Documented troubleshooting procedures and SOPs, improving team efficiency and reducing repeat incidents by 15%.

Technical Support Analyst

Cedar Valley Tech Solutions – Round Rock, TX

January 2023 – May 2024

• Supported Windows Server and Active Directory environments, resolving 90% of incidents within SLA timelines.
• Assisted in GPO modifications and user provisioning, improving configuration accuracy by 20%.
• Troubleshot hardware and software issues across 150+ endpoints, reducing downtime by 18%.
• Maintained system documentation and user issue logs, increasing knowledge base utilization by 25%.

EDUCATION

Bachelor of Science in Information Technology

Texas State University

Brandon Carter

Dallas, TX

(214) 555-8934

brandon.carter.tech@gmail.com

linkedin.com/in/brandoncarter-ad

SUMMARY

Results-driven Active Directory Administrator with 4+ years of experience in Active Directory, Group Policy, and Cloud Integration within enterprise infrastructure environments. Proven record of improving system uptime to 99.9% and reducing incident recurrence by 30%. Expertise in Identity Management and PowerShell Scripting to optimize operations, mitigate security risks, and enhance infrastructure scalability.

SKILLS

Active Directory

Group Policy

PowerShell Scripting

DNS DHCP

Identity Management

Cloud Integration

EXPERIENCE

Active Directory Administrator

LoneStar Infrastructure Group – Dallas, TX

March 2022 – Present

• Managed Active Directory environments supporting 5,000+ users, improving authentication performance by 30% through optimized configurations.
• Automated administrative processes using PowerShell, reducing manual workload by 35% and increasing operational efficiency.
• Administered GPOs, DNS, and DHCP services, maintaining 99.9% uptime across enterprise systems.
• Led Active Directory migrations and upgrades, completing 10+ projects with zero critical downtime.

Systems Administrator

Redwood Tech Services – Plano, TX

July 2020 – February 2022

• Supported Windows Server and AD infrastructure, resolving 95% of incidents within SLA and improving service reliability.
• Monitored system performance and logs, reducing recurring issues by 25% through proactive analysis.
• Implemented backup and disaster recovery strategies, decreasing recovery time by 40%.
• Collaborated with development and QA teams to ensure the successful deployment of system changes.

EDUCATION

Bachelor of Science in Computer Information Systems

University of Texas at Dallas

Jonathan A. Reynolds

Arlington, VA

(703) 555-6421

jonathan.reynolds@enterpriseit.com

linkedin.com/in/jonathan-reynolds-infra

PROFESSIONAL SUMMARY

Results-driven Active Directory Administrator with 10+ years of experience in Active Directory, Cloud Architecture, and Identity Governance within large-scale enterprise environments. Proven record of improving infrastructure scalability by 40% and reducing security incidents by 35%. Expertise in Enterprise Architecture and Disaster Recovery to optimize system performance, mitigate operational risk, and drive strategic infrastructure transformation.

CORE SKILLS

Active Directory

Azure AD

Identity Governance

Group Policy

Disaster Recovery

Infrastructure Design

EXPERIENCE

Senior Active Directory Administrator

Potomac Enterprise Solutions – Arlington, VA

January 2019 – Present

• Architected global Active Directory infrastructure supporting 15,000+ users, improving scalability by 40% across multi-domain environments.
• Led domain consolidation and migration initiatives, completing 20+ projects with zero critical outages.
• Directed disaster recovery strategy and implementation, reducing recovery time objectives by 50%.
• Served as escalation authority for critical incidents, improving resolution speed by 35% through root cause analysis.

Active Directory Engineer

Capital Tech Systems – Washington, DC

May 2014 – December 2018

• Designed and implemented GPO and security frameworks, reducing unauthorized access risks by 30%.
• Managed hybrid environments, including Azure AD, enhancing identity governance and reducing manual provisioning by 25%.
• Oversaw DNS, DHCP, and domain controller operations, maintaining 99.9% uptime across the infrastructure.
• Collaborated with cross-functional teams to deliver infrastructure upgrades, improving system performance by 20%.

EDUCATION

Bachelor of Science in Information Systems

George Mason University

• Led analysis of business, technology, and security requirements, aligning Active Directory design to support 2,000+ users while reducing access-related incidents by 25%.
• Implemented target-state Active Directory architecture, improving authentication latency by 30% and ensuring scalability for projected 40% growth across hybrid environments.
• Collaborated with IT, security, and business stakeholders to coordinate migrations, minimizing downtime to under 30 minutes per application during phased transitions.
• Defined migration strategies for directory-integrated applications, safeguarding production stability and achieving 99.9% service availability through rigorous change management, monitoring, and rollback planning.
• Enforced security standards and hardening baselines, reducing privileged access risks by 35% and passing external audits with zero critical findings while maintaining compliant configurations.
• Delivered third-level support and comprehensive documentation, resolving complex directory incidents within SLA targets and increasing first-call resolution by 20% through knowledge base improvements.

Core Skills:

• Active Directory
• Group Policy
• Identity Management
• Directory Migration
• Security Hardening
• PowerShell Scripting

• Escalated unresolved technical issues to management or vendors, reducing mean time to resolution by 35% while ensuring continuity across Active Directory and infrastructure services.
• Maintained and updated system documentation for 100+ production environments, improving audit readiness and reducing onboarding time for new administrators by 25%.
• Installed and configured hardware and software aligned with project requirements, supporting the deployment of 50+ servers and ensuring 99.9% operational reliability post-implementation.
• Automated administrative processes using scripting, decreasing manual workload by 40%, and improving consistency across system provisioning, monitoring, and maintenance tasks.
• Coordinated with development, QA, and UAT teams to validate releases, achieving 95% successful first-time deployments through adherence to structured change and release management processes.
• Proactively recommended infrastructure improvements and ensured production readiness, reducing incident rates by 20% while maintaining compliance with internal controls and industry standards.

Core Skills:

• Active Directory
• PowerShell Scripting
• System Automation
• Change Management
• Infrastructure Design
• Release Management

• Monitored Active Directory environments proactively, identifying 90% of potential issues before impact by enforcing standardized processes and maintaining consistent health checks across global infrastructure.
• Executed daily operations, including GPO management and AD reporting, supporting 3,000+ directory objects while maintaining strict compliance with internal governance and operational guidelines.
• Maintained and supported internal tools and integrated systems, improving system uptime to 99.95% and ensuring seamless interoperability across identity-dependent enterprise applications.
• Collaborated with cross-functional global teams to drive continuous improvements, contributing to 15+ infrastructure enhancement initiatives that increased efficiency and reduced recurring incidents by 20%.
• Analyzed event and security logs to detect anomalies, mitigating risks across server infrastructure and reducing security incidents by 30% through timely corrective actions and monitoring.
• Planned and deployed upgrades, fixes, and new modules in production, resolving complex level 3 incidents within SLA targets and ensuring stable, secure Active Directory service delivery.

Core Skills:

• Active Directory
• Group Policy
• Security Monitoring
• Log Analysis
• Infrastructure Support
• Patch Management

• Administered day-to-day Active Directory operations, managing 5,000+ objects and ensuring consistent performance across Windows Server environments with less than 1% unplanned downtime.
• Troubleshot complex issues across on-premises and Azure AD, resolving 95% of incidents within SLA while maintaining stability for domain controllers, DNS, and DHCP services.
• Coordinated domain controller maintenance and patching schedules, improving system reliability by 20% and ensuring high availability across distributed infrastructure environments.
• Managed Group Policy, OUs, and directory roles, optimizing configurations that reduced login issues by 30% and enhanced policy enforcement across enterprise systems.
• Reviewed existing implementations and generated technical reports, identifying inefficiencies and recommending improvements that increased operational efficiency by 25%.
• Implemented disaster recovery strategies and supported system integrations, reducing recovery time objectives by 40% and ensuring seamless connectivity between Active Directory and integrated platforms.

Core Skills:

• Active Directory
• Azure AD
• Group Policy
• DNS DHCP
• Disaster Recovery
• Windows Server

• Managed Active Directory and user account lifecycle for 4,000+ users, enforcing access controls and reducing account-related incidents by 30% through structured identity governance practices.
• Installed and maintained Windows Server environments (2012–2019), achieving 99.9% uptime while securing systems in compliance with STIG and IAVM standards.
• Resolved complex issues across AD, GPO, ADFS, and identity systems, closing 95% of tickets within SLA and improving authentication reliability across enterprise platforms.
• Designed and maintained Active Directory infrastructure with robust backup and recovery solutions, reducing recovery time objectives by 50% and ensuring data integrity.
• Implemented identity management solutions and ensured compliance with strict regulatory frameworks, strengthening security posture and passing audits with zero critical findings.
• Analyzed system requirements and planned infrastructure upgrades, optimizing VMware and physical environments to support 35% capacity growth while maintaining operational stability.

Core Skills:

• Active Directory
• Windows Server
• Identity Management
• Group Policy
• VMware Virtualization
• Security Compliance

• Ensured infrastructure and solution designs aligned with organizational standards, reducing configuration drift by 25% and maintaining consistent Active Directory architecture across enterprise environments.
• Maintained data integrity and compliance with corporate taxonomy, collaborating with architects to improve data feeds and interfaces, increasing data accuracy by 30% across integrated systems.
• Developed technical solutions from business requirements and functional specifications, supporting 20+ implementations that enhanced system performance and streamlined identity-related workflows.
• Evaluated the impact of changes on existing architecture and processes, mitigating risks and reducing deployment issues by 35% through structured analysis and planning.
• Integrated applications with Active Directory and external platforms, enabling seamless interoperability and reducing manual provisioning efforts by 40% across connected systems.
• Executed testing strategies and documented results, achieving 98% defect detection before production while ensuring reliable deployments and stable operational performance.

Core Skills:

• Active Directory
• System Integration
• Data Integrity
• Technical Design
• Test Planning
• Application Development

• Monitored server performance across on-premise and cloud environments, generating reports that improved system efficiency by 25% and maintained consistent service levels above 99.9% availability.
• Architected and managed Active Directory infrastructure, including FSMO roles, trusts, Kerberos, and replication, supporting 6,000+ users with optimized authentication and directory performance.
• Designed OU hierarchies and access models, enforcing least-privilege principles that reduced unauthorized access risks by 40% and improved administrative delegation efficiency.
• Administered domain controllers with full lifecycle oversight, implementing backup and disaster recovery strategies that reduced recovery time by 50% and ensured data resilience.
• Led migrations and upgrades for Active Directory and domain services, completing 15+ initiatives with zero critical downtime through structured planning and execution.
• Managed Azure Active Directory services, including licensing, role assignments, and secure remote administration, enhancing identity governance and reducing manual provisioning efforts by 35%.

Core Skills:

• Active Directory
• Azure AD
• Group Policy
• Domain Services
• Identity Governance
• Disaster Recovery

• Designed enterprise-scale Active Directory, Azure, and Windows Services architectures, supporting 10,000+ users across global environments while ensuring scalability, security, and alignment with strategic infrastructure objectives.
• Collaborated with infrastructure and operations teams to deliver architectural guidance, improving deployment success rates by 30% and ensuring consistent implementation of directory and security best practices.
• Led continuous improvement initiatives for Active Directory and Windows security technologies, reducing security vulnerabilities by 35% across multiple geographically distributed environments.
• Served as top-tier escalation authority, resolving critical incidents within SLA and decreasing recurring issues by 25% through root cause analysis and strategic remediation planning.
• Oversaw major design changes and enforced standards, strengthening system integrity and ensuring compliance with security controls across complex multi-domain Active Directory infrastructures.
• Engineered and administered advanced directory services, including GPOs, ADFS, PKI, DNS, and DFS, enhancing authentication reliability and improving system performance by 20% across integrated platforms.

Core Skills:

• Active Directory
• Azure AD
• Group Policy
• PKI Security
• DNS DHCP
• Identity Federation

• Integrated third-party solutions with Active Directory, enabling SSO and cloud authentication for 25+ applications while improving user access efficiency and reducing login-related issues by 30%.
• Designed and validated global backup and disaster recovery architecture, decreasing recovery time objectives by 45% and ensuring resilience across distributed directory environments.
• Led customer-facing solution discussions and implementations, delivering 20+ upgrades and enhancements on schedule while aligning technical solutions with evolving business requirements.
• Built strong stakeholder relationships and provided continuous engagement, improving customer satisfaction scores by 20% through proactive communication and responsive issue resolution.
• Produced detailed documentation, reports, and process workflows, enhancing transparency and enabling faster onboarding while reducing operational errors by 25% across support teams.
• Recommended automation and cost optimization strategies, reducing operational expenses by 15% and streamlining identity management processes through improved tooling and system integration.

Core Skills:

• Active Directory
• Single Sign-On
• Disaster Recovery
• Cloud Integration
• Process Automation
• Technical Documentation

• Managed complex, distributed Active Directory environments supporting 15,000+ users and 11,000+ devices, ensuring high availability and consistent directory performance across multi-domain infrastructures.
• Troubleshot authentication and access issues with infrastructure teams, resolving 95% of incidents within SLA and improving user access reliability across enterprise applications.
• Enforced compliance with IT policies and standards, strengthening governance and reducing configuration deviations by 30% through regular audits and remediation actions.
• Configured and optimized 600+ Group Policy Objects, leveraging advanced filtering and targeting techniques to improve system performance and reduce policy-related incidents by 25%.
• Diagnosed and resolved replication and domain controller issues, enhancing directory synchronization accuracy and reducing replication latency by 40% across sites and subnets.
• Administered domain services including FSMO roles, DNS, DHCP, and Certificate Services, ensuring secure operations and maintaining audit readiness through effective backup and recovery practices.

Core Skills:

• Active Directory
• Group Policy
• DNS DHCP
• Certificate Services
• Domain Management
• Replication Troubleshooting

• Operated and deployed Active Directory services across enterprise infrastructure, collaborating with cross-functional teams to support 8,000+ users while ensuring stable and secure identity services.
• Identified service improvement opportunities and implemented enhancements, increasing operational efficiency by 30% and reducing recurring incidents through proactive optimization initiatives.
• Applied ITIL-based processes to troubleshoot and resolve technical issues, achieving 95% SLA compliance and minimizing downtime across critical authentication and infrastructure services.
• Monitored system performance and reviewed logs, maintaining 99.9% availability and ensuring the integrity of servers, processes, and scheduled operations across distributed environments.
• Provided escalation support and vendor coordination for priority incidents, accelerating resolution times by 40% and strengthening the reliability of enterprise applications and services.
• Automated administrative workflows and improved documentation, reducing manual effort by 35% while enabling consistent operations and seamless collaboration across infrastructure, architecture, and security teams.

Core Skills:

• Active Directory
• ITIL Processes
• System Monitoring
• Log Analysis
• Process Automation
• Incident Management

• Engineered cloud-based data center services for enterprise environments, supporting DoD-aligned initiatives and improving infrastructure scalability by 40% across dynamic Active Directory deployments.
• Planned and maintained Active Directory infrastructure lifecycle, ensuring SLA compliance above 99.9% while managing domain controllers, DNS services, and forest-wide configurations.
• Directed ongoing deployment activities, including trust management and domain controller provisioning, supporting 10+ domains and enhancing directory resilience and operational continuity.
• Acted as subject matter expert on Active Directory technologies, advising stakeholders on architecture decisions and aligning solutions with evolving market trends and enterprise requirements.
• Collaborated with internal and external teams to translate technical objectives into detailed design specifications, improving delivery accuracy and reducing implementation gaps by 30%.
• Recommended and implemented infrastructure enhancements, strengthening security, scalability, and performance while optimizing compute, storage, and network resources across cloud environments.

Core Skills:

• Active Directory
• Cloud Architecture
• DNS Services
• Infrastructure Design
• Identity Management
• Performance Optimization

• Provided 24x7 operational support for Active Directory environments, maintaining 99.9% uptime and ensuring continuous availability of authentication and directory services across enterprise infrastructure.
• Troubleshot and resolved incidents of varying complexity, achieving 90% first-time resolution while collaborating with cross-functional teams and vendors to restore services efficiently.
• Implemented changes from routine to complex deployments, reducing system disruptions by 25% through structured planning, validation, and adherence to change management processes.
• Administered core Active Directory functions, including domain controllers, GPOs, sites, and schema updates, supporting 5,000+ objects with secure and scalable configurations.
• Analyzed system data and trends to perform root cause analysis, decreasing recurring incidents by 30% and driving continuous service improvement initiatives.
• Managed backup, restore, and capacity planning processes, improving recovery readiness by 40% while ensuring compliance with security standards and operational policies.

Core Skills:

• Active Directory
• Group Policy
• Incident Management
• Capacity Planning
• Backup Recovery
• Performance Monitoring

• Led Active Directory operations team, ensuring 100% adherence to delivery timelines and enforcing organizational policies to maintain consistent service quality across infrastructure support functions.
• Monitored ITSM ticket performance and audited SLT compliance, improving resolution accuracy by 25% and ensuring proper documentation and accountability across all support activities.
• Mentored team members on technical and career development, increasing team productivity by 20% and strengthening expertise in Active Directory and infrastructure management practices.
• Directed project coordination and reviewed system development activities, aligning schedules and resources to deliver 15+ initiatives on time with minimal operational disruption.
• Troubleshot complex infrastructure issues using PowerShell and diagnostic tools, resolving critical incidents 30% faster while collaborating with vendors and remote technical teams.
• Developed and documented operational procedures and corrective action plans, enhancing process efficiency by 35% and ensuring reliable maintenance of Active Directory environments.

Core Skills:

• Active Directory
• PowerShell Scripting
• ITSM Management
• Incident Resolution
• Process Improvement
• Team Leadership

• Supported Active Directory operations in multi-geo environments, handling L2 and L3 incidents for 4,000+ users while maintaining SLA compliance above 98% and ensuring service continuity.
• Troubleshot complex issues across AD, DNS, and VMware/Hyper-V systems, resolving 90% of incidents within SLA and improving infrastructure reliability across distributed environments.
• Enforced ITIL-based processes and escalated unresolved issues promptly, reducing backlog by 25% and ensuring adherence to quality of service and operational standards.
• Designed and managed multi-forest Active Directory architectures, supporting geographically dispersed enterprises and improving authentication performance by 30% across domains.
• Implemented backup and restoration strategies with regular patching cycles, enhancing system security and reducing recovery time objectives by 40% for critical services.
• Monitored hardware and system performance, providing actionable recommendations that improved overall infrastructure efficiency by 20% and supported data center consolidation initiatives.

Core Skills:

• Active Directory
• VMware HyperV
• DNS Management
• ITIL Processes
• Backup Recovery
• Performance Monitoring

• Monitored database infrastructure health using enterprise tools, maintaining 99.9% availability and proactively remediating 85% of issues before service impact through threshold tuning and event analysis.
• Resolved escalated DBA incidents and administrative tasks, achieving 95% SLA compliance while coordinating across Tier II/III teams to ensure efficient issue resolution and service continuity.
• Documented standard operating procedures and guided service desk teams, reducing repeat incidents by 30% and improving first-level resolution effectiveness across infrastructure support functions.
• Executed change management processes through CAB/CRB participation, implementing 20+ changes with zero critical failures while ensuring compliance with organizational policies and standards.
• Analyzed and remediated STIG compliance gaps, achieving 100% audit readiness and supporting successful cybersecurity inspections without critical findings.
• Coordinated with internal divisions and external vendors, delivering project support and resolving complex issues 25% faster through structured escalation and cross-team collaboration.

Core Skills:

• Database Monitoring
• Incident Management
• Change Management
• STIG Compliance
• Event Analysis
• Technical Documentation

• Administered enterprise Active Directory, Group Policy, and DNS environments, supporting 8,000+ users while ensuring secure, stable operations across complex infrastructure landscapes.
• Engineered and managed GPO configurations, improving policy enforcement by 30% and enhancing system consistency across diverse enterprise endpoints.
• Implemented role-based access controls, reducing unauthorized access risks by 35% and strengthening security posture across critical enterprise assets.
• Designed and maintained disaster recovery strategies, decreasing recovery time objectives by 45% and ensuring business continuity for directory and network services.
• Diagnosed and resolved communication and access issues across multi-platform environments, achieving 95% incident resolution within SLA and improving user experience.
• Developed and maintained SOPs and testing plans, increasing operational efficiency by 25% while ensuring consistent service delivery and compliance with enterprise standards.

Core Skills:

• Active Directory
• Group Policy
• DNS Management
• Access Control
• Disaster Recovery
• System Troubleshooting

• Developed PowerShell automation and utilities, reducing manual administrative effort by 40% while improving consistency across Active Directory provisioning, maintenance, and integration workflows.
• Provided enterprise architectural guidance for Active Directory, supporting 10,000+ users and ensuring scalable, secure designs aligned with evolving business and infrastructure requirements.
• Implemented upgrades, tools, and integrations, successfully delivering 25+ initiatives, including mergers and acquisitions, with minimal disruption and seamless directory consolidation.
• Conducted proof of concept evaluations and analyzed business requirements, recommending optimized solutions that improved system performance and reduced operational costs by 20%.
• Delivered 24x7 escalation support and coordinated with vendors, resolving critical incidents 35% faster through structured problem management and post-incident reviews.
• Administered core AD services including GPO, DNS, DHCP, replication, and disaster recovery, maintaining 99.9% availability and ensuring secure, compliant infrastructure operations.

Core Skills:

• Active Directory
• PowerShell Scripting
• Group Policy
• DNS DHCP
• Disaster Recovery
• Infrastructure Design

• Delivered Windows system administration support, managing 3,000+ user accounts and ticket queues via ServiceNow while maintaining high responsiveness and improving resolution times by 25%.
• Maintained and troubleshot Windows Server, Active Directory, DNS, and DHCP services, achieving 99.9% uptime and ensuring stable domain operations across enterprise environments.
• Administered user identities, permissions, and group policies, reducing access-related incidents by 30% through consistent enforcement of security and configuration standards.
• Executed hardware and software installations aligned with project and security directives, supporting 200+ devices and ensuring compliance with government and organizational requirements.
• Supported enterprise IAM solutions using RadiantLogic FID, improving data quality and reducing identity synchronization errors by 35% through process enhancements and monitoring.
• Documented user issues and implemented process improvements, increasing operational efficiency by 20% while strengthening compliance, security controls, and service delivery consistency.

Core Skills:

• Active Directory
• Windows Server
• DNS DHCP
• Identity Management
• ServiceNow ITSM
• RadiantLogic FID

• Architected global Active Directory infrastructure for 12,000+ users, leading domain consolidation and Group Policy design to improve security compliance and reduce administrative overhead by 35%.
• Planned and implemented enterprise GPO strategies, enforcing policy compliance across servers and endpoints while decreasing configuration drift and related incidents by 30%.
• Troubleshot complex identity and access issues across AD, ADFS, and IAM systems, resolving 95% of incidents within SLA and improving authentication reliability.
• Administered DNS, DHCP, and AWS Managed Microsoft AD environments, enhancing hybrid integration and supporting seamless connectivity between cloud and on-premise systems.
• Directed system administration activities and supervised technical teams, delivering 20+ infrastructure projects while ensuring alignment with long-term operational and strategic IT goals.
• Optimized system performance and reliability through OS enhancements and automation, increasing infrastructure efficiency by 25% and maintaining consistent service availability.

Core Skills:

• Active Directory
• Group Policy
• AWS Directory
• DNS DHCP
• Identity Management
• System Administration