Thomas Barrera Email & Phone Number

Administered and optimized Siemens Teamcenter lifecycle management software, ensuring seamless integration and functionality within the enterprise environment.Administered Oracle databases, ensuring optimal performance and reliability for enterprise applications.Managed AWS-hosted servers, overseeing installation, configuration, and maintenance to support cloud infrastructure.Provided tier 2 and tier 3 technical support, resolving complex issues and minimizing downtime across the enterprise.Delivered training and support to end users, improving efficiency and proficiency with lifecycle management software.Implemented cost-saving measures, reducing software licensing expenses by over $200,000.

Led the design and execution of a seamless migration from Exchange 2010 to Exchange 2016, efficiently transitioning 50,000 users and eliminating legacy system vulnerabilities.Engineered and enforced an advanced email core service policy, enhancing data retention, mailbox management, and archival processes, ensuring compliance and security.Strategically upgraded and optimized 40 on-premises mailbox servers across six global sites, significantly improving performance and reliability within the DOD Air Force cloud infrastructure.Delivered expert tier 2 and tier 3 support, providing critical guidance and rapid issue resolution, bolstering the overall security posture and operational efficiency.Developed and conducted comprehensive training programs for tier 1 and 2 administrators, standardizing operating procedures and enhancing system maintenance practices.

Acted as the primary technical contact, providing advanced support and resolving critical issues for enterprise clients using O365, Azure, Azure AD, Exchange Online, and Exchange on-premises.Led customer on-site migrations to Azure, optimizing customers’ cloud transition strategies and enhancing their IT infrastructure.Delivered in-depth technical workshops and training sessions, empowering client IT teams with robust knowledge of Microsoft technologies and best practices.Diagnosed and resolved complex server issues, leveraging deep expertise in Exchange to ensure optimal performance and reliability.Collaborated with technical leadership to develop and implement custom solutions, addressing specific business needs and enhancing overall system efficiency.Responded to high-priority outages and critical incidents, providing rapid resolution while maintaining stringent adherence to customer SLAs

Managed and administered on-premises Active Directory, optimizing Group Policy Objects (GPOs) and ensuring seamless replication through AD Sites and Services.Delivered targeted training sessions on SharePoint functionality, enhancing the productivity and proficiency of 75 end users.Served as the primary SharePoint administrator, overseeing server management, site creation, and maintenance, ensuring a reliable and user-friendly platform.Provided end-user account support and servicing, ensuring smooth and secure operations across the organization.Performed comprehensive Tier I and II support, conducting fault analysis and resolving over 200 complex SharePoint-related issues.

Conducted site surveys and infrastructure assessments to design and deploy hybrid cloud solutions, tailored to meet specific customer requirements.Traveled to customer sites to oversee the installation and configuration of server racks, SANs, EMC Isilon storage, and flash storage systems, ensuring seamless integration.Specialized in configuring EMC Isilon and flash storage, presenting storage resources to hypervisors to optimize system performance and resource allocation.Installed and configured various networking and storage devices, including Cisco and Dell Technologies, and performed cable management in data centers.Managed system loading, network configuration, and operation checkout, troubleshooting and resolving issues with commercial off-the-shelf (COTS) software such as ZenOSS, Red Hat Linux, Puppet, Microsoft Server, and VMWare ESXI 7.0.Maintained comprehensive technical documentation, providing clear guidelines for infrastructure deployment and management to ensure consistent and efficient operations.

Administered and managed Active directory, handling user accounts, security groups, and distribution lists to maintain secure and efficient access controls.Provided comprehensive support for Microsoft Exchange, including mailbox management and public cloud access optimization, utilizing Microsoft Exchange system manager.Performed Public Key infrastructure (PKI) tasks, contributing to the security and integrity of the organization’s communication and data.Facilitated user account transfers and data migrations, ensuring seamless transitions and maintaining user accessibility across different field sites.Utilized remedy to track and resolve technical issues, ensuring timely updates and closure of support tickets to maintain high levels of customer satisfaction.

Administered Active Directory objects such as computer, user, and group accounts. As well as managed DHCP, and group policyControlled Windows Servers and workstations for end-user access within the Defense Information System Network (DISN) backbone providing secure naval messaging for 14 proprietary messaging systems to include CUDIX, AMHS, FSM, FMX/DUSC, MCS, NOVA, MMS, NICE, VERDINDeveloped standard operating procedures for the administration of Naval Regional Enterprise Message System, AMHS, and SQL databases, and trained technicians to follow proceduresCoordinated communication and service shifts based on assets among Pacific, Atlantic and Mediterranean regions