Senior Systems Administrator Infrastructure Engineer, DoD/DoJ Expert

Femi Showunmi

******@*****.***, Cell # 240-***-****

Bowie, MD 20716

Active Top-Secret Clearance

Summary

Senior Systems Administrator / Infrastructure Engineer with 10+ years of experience supporting enterprise IT environments across Department of Defense (DoD), Army, FBI, Department of Justice, and other federal agencies. Proven expertise in designing, deploying, and maintaining Windows and Linux server infrastructures, virtualization platforms, cloud environments, and secure network architectures supporting mission-critical systems.

Extensive experience managing Windows Server environments (2012–2025), Active Directory, DNS, DHCP, Group Policy, virtualization (VMware ESXi, Hyper-V), storage systems, and enterprise backup solutions including NetApp, VEEAM, and EMC technologies. Skilled in deploying and maintaining Azure cloud solutions, Microsoft Intune, AVD environments, and enterprise collaboration platforms such as Med365/A356 and Office 365.

Strong background in DoD security compliance and vulnerability management, utilizing tools such as ACAS, SCAP, STIG Viewer, PCAT, BASS, and McAfee HBSS to maintain secure and compliant infrastructures aligned with NIST and FISMA standards. Experienced supporting Authority to Operate (ATO) processes and implementing security best practices across enterprise systems.

Highly proficient in virtualization, infrastructure automation, system monitoring, and performance optimization, leveraging technologies including VMware vSphere, vMotion, HA clusters, SolarWinds, SCCM/MECM, ServiceNow, JIRA, and PowerShell scripting. Adept at managing enterprise environments with hundreds of servers and thousands of users, ensuring high availability, scalability, and operational efficiency.

Demonstrated success delivering Tier 3 infrastructure support, managing complex troubleshooting, incident resolution, system migrations, disaster recovery testing, and infrastructure upgrades while collaborating with cross-functional teams in Agile and ITIL-driven environments.

Technical Skills

Systems & Server Administration

Windows Server 2012, 2016, 2019, 2022, 2025

Linux / Red Hat Enterprise Linux

Active Directory, Group Policy (GPO)

DNS, DHCP, WINS

Domain administration and user management

System monitoring and performance tuning

Virtualization & Cloud

VMware vSphere / ESXi

VMware vMotion, HA Clusters

Hyper-V

Azure Cloud

Azure Virtual Desktop (AVD)

Cloud Foundry

Virtual Desktop Infrastructure (VDI)

Security & Compliance

ACAS, SCAP, STIG Viewer

BASS, PCAT

McAfee HBSS

NIST / FISMA compliance

ATO support

Vulnerability remediation and security hardening

Storage & Backup Technologies

NetApp Storage Administration

RAID Groups, Aggregates, Vservers, Volumes

VEEAM Backup & Recovery

EMC Storage / Data Domain

Veritas Backup Exec

HP Data Protector

Catalogic DPX

Networking & Infrastructure

LAN / WAN administration

Cisco Networking (4500, 3560, 3750, Nexus)

VLAN, VPN, Routing, Switching

Palo Alto & ASA Firewalls

Load Balancers (F5)

VOIP infrastructure

Network troubleshooting and monitoring

Monitoring & Management Tools

SolarWinds Orion NPM

Cisco Prime

SCOM

HP OpenView

LANDesk

WhatsUp Gold

Endpoint & Configuration Management

SCCM / MECM

Microsoft Intune

Desktop and server imaging

Patch management and compliance

Endpoint configuration and deployment

DevOps / Automation / Scripting

PowerShell

Batch scripting

Cron jobs

Automation scripting

Configuration management

Enterprise Applications & Platforms

Citrix XenApp / XenDesktop

SharePoint

Exchange / Office 365

IIS Web Servers

WebSphere / Tomcat / JBoss

ITSM & Collaboration Tools

ServiceNow

JIRA

Remedy

Agile / Scrum methodologies

ITIL processes (Incident, Change, Problem Management)

Additional Technologies

RSA Authentication

BES / AirWatch MDM

SQL queries, stored procedures

Static code analysis tools (CAST, SonarQube)

Education:

Bachelor of Science- Computer Information Technology and Marketing (May 2005) - University of Maryland, University College

Certifications:

Digital Institute (May 2018)

Comp TIA A+

Network +

Security + CE

CCNA

CCA Citrix Certified Administrator

Scrum Master, DISA ACAS Version 5.3

Professional Experience:

Cherokee Nation Businesses/US DOD-DHA /US Army 07/2020 -12/2025

Systems Administrator

Provided infrastructure support to DHA and Army in planning, migrating, maintaining and delivering of information technology services, such as Med365/A365 provision in Depo, Azure cloud solution and Microsoft Intune and AUDS. Provide maintenance during Image of Desktops/Laptops/VMs and ensure the availability of information systems in a windows server 2016/2019/2022/2025 Infrastructure environment.

Managed and supported enterprise network printers, including installation, configuration, driver management, and troubleshooting for end users.

Improved server and network stability by applying enterprise level Windows Server performance tuning, SNMP, firewall policy improvements, SQL monitoring, ESS/VSS readiness checks, escalations handling, and NIST aligned security practices supported through ServiceNow/Remedy workflows.

Support DOD IA compliance with DOD tools using ACAS, SCAP, Stigviewer, PCAT, BASS and McAfee HBSS.

Use MECM to patch servers and workstations to ensure applications are compliant.

Assist with the development, testing, updating, patching and deployment of Workstation/Laptop image.

Work with ISSO to maintain ATO.

Utilized JIRA to track infrastructure tasks, incidents, and remediation activities, ensuring timely resolution in accordance with operational SLAs and mission priorities.

Managed JIRA workflows and dashboards to prioritize vulnerabilities, system enhancements,

Create and administer system documentation, tuning system performance, install system software and allocate storage space.

Monitored and maintained printer services and print servers, resolving printer connectivity, queue, and network printing issues to ensure uninterrupted printing operations.

Manage and maintain Active Directory, Service Accounts, DNS, DHCP, Group Policy, Users and Groups Management

Admin rights to AUDS

Serve as an Entitlement manager to manage Med365 and A365 in DEPO

Deploy and Manage AVD for over 500 remote Users.

Manage all devices and User access in AUDS for all Army Users

Respond to AESMP Ticket submissions, addressing critical in a timely manner

Provision user email accounts, Share Mailboxes, Distribution lists and Permissions.

Administer, maintain, and monitor the performance and capacity of NetApp.

Administration of RAID Groups, Aggregates, Vserver and volumes.

Provide backup recovery, Add and Troubleshoot and backup all VMs using VEEAM backup tool.

Administer, Maintain and troubleshot VMware virtualization products to optimize and manage IT resource for servers and applications.

Manage VMs across hosts within a HA Cluster to perform maintenance tasks on ESXi Hosts

Use VMware vMotion to eliminate application downtime from planned server maintenance by migrating virtual machines between hosts

Created clones from existing VMs and deployed several VMs from Templates and customized their configurations as-needed.

Feasibility analysis, testing and implementing enhancement based on client needs/requirement such as Incident, Change, Asset management etc in ServiceNow.

Provide Level 3 user support of tickets assigned to ServiceNow by supporting systems/application configuration and management.

Systems Administrator 07/2019- 06/2020

22 Century Technology - Contractor for PFPA

Scan, test, and remediate issues based on Foundstone Scans, CIS-CAT benchmarks or ACAS or SCAP security scoring tools

Perform system administration on HBSS servers, including ePolicy Orchestrator upgrades and client product patches.

Assist with the development, testing, updating, patching and deployment of computer/Laptop image

Optimized multi tier Windows Server 2012/2016/2019 architectures through advanced troubleshooting, firewall adjustments, SQL/IIS enhancements, performance analytics, FISMA/NIST-aligned security hardening, ESS/VSS integration support, automation scripting, and critical application escalations managed through ServiceNow

Provide backup recovery, Add and Troubleshoot and backup all VM using VEEAM backup tool

Assist In making sure Solarwinds are configured correctly to track all the 3rd party applications and the servers.

Managed user accounts for all systems via Microsoft Active Directory

Utilize Active Directory for tracking internal users: resetting passwords, managing accounts, and granting access

Managed Users Permissions using Active Directory.

Administer, Maintain and troubleshot VMware performance and tuning issues

Use SCCM to patch servers, workstations to ensure applications are compliant

Worked closely with teams and attended weekly meetings with their management ensuring the Service Level Agreements (SLA) are met.

Systems Administrator 05/2018 – 07/2019

Buchanan-Edwards, Inc. - Contractor for FBI

Provide third-level application software support for FBI Delta Application, analyze system errors and troubleshoot network, server, and database errors. Document/resolve system bugs; reported by the Development team.

Ensured reported issues were resolved more quickly by documenting and tracking application issues, using Agile Methodology, as well as by participating in scrum meetings, which assisted with prioritization of issues

Performed software application and disaster recovery testing; ensuring business-readiness following failovers

Responsible for the operation and administration of IIS web servers across Engineering, QA and Production environments, .Net application support and integration with IIS, Applications and making sure the Availability of the Production Infrastructure Environments

Managing around 50+ 2016 HTTP/s Webservers and 5+ UNIX Servers which Hosts WebSphere Application Servers.

Perform Windows Operating System Upgrade on Windows 2012 R2 to Windows 2016.

Manage Active Directory Infrastructure Administration, Application/system support in a .NET environment

Manage Webservers and Troubleshoot the .NET applications through Advanced IIS tracing techniques.

Work with the business units to design, plan and implement critical applications into a Development, QA and Production environment.

Co-ordinated with Application team to understand their application nature and worked with build team to generated the required build package for .Net applications

Install deploy Patches related to OS Application using BigFix console

Deploy/ Configure client and good understanding of MacAfee Antivirus, Splunk for monitoring.

Create/Renew SSL Certificates for all Enterprise .Net/Java Applications on the servers

Knowledge with F5 based VIP/DNS configurations for Enterprise applications.

Work with Firewall team to understand the connection issues and strong knowledge of Firewall Rules request and analyzing the requirement for servers across DMZ's

Familiarity using win batch, batch files, Power Shell script and analyzing memory dumps.

Systems Engineer 12/2017 – 05/2018

DK Consultant - Contractor for MVA

Perform system administrator/technical support in supporting Maryland Motor Vehicle Administrator applications in a very high visible and high demanding MVA.

Manage over 400 servers both windows and Linux (Red hat Enterprise) environment, ensuring 99.9% or better uptime. Evaluate, monitor and enhance IT infrastructure implanting high availability, reliability, scalability, data confidentiality and system integrity.

Manage file sharing and network printer sharing, ensuring proper access and connectivity for users.

Support and troubleshoot MVA Legacy Workstations, Scanner, Camera andIgenico ISC250 card and work with the developer to make sure new quarterly patch are deployed properly and executed on all MVA Braches.

Setup and administer HP ProLiant Ml370 G6, ML350p Gen8 across our main office and branches

Install, administer, and support Windows 2012 r2 on Hypervisors and Esxi 6.5 virtual machine and clusters across the MVA sites

Setup and configure site and services on all the DC’s

Monitor printer and network performance using Orion SolarWinds NPM to maintain system availability

Configure DFS replication on all the DC’s

Setup ILo Management on all HP server and HP System Management and Insight HP Remote Support

Setup Nic teaming on all of our branch Host servers.

Implement and enable HA Cluster, VMotion functionality and created a custom template a new built VM on our EXSI Host

Provide support and resolution between developer, tester, and other groups in production in an effort to Patch, Hotfix and or Resolve MVA applications issue in a timely manner.

Use event logs and MVA CECViewer to identify application error.

Understanding of Batch file and Power shell scripting and AD tools.

Use SCCM to create and deploy image to laptops and desktops.

Use SCCM to patch all servers and applications compliance

Provide administrative support for backup HP Data protector manager and Catalogic DPX backup system

Ensure full and incremental data backups were successful; perform data restore for user as needed

Resolve a history of problematic network failure by troubleshooting LAN/WAN connections between multiple branches

Stabilize and protect client network and systems, by building file servers to maximize web hosting terminal server.

Provide On-call support to all servers and 25 branches.

Systems/Network Administrator 09/2016–7/2017

Artel LLC

Primary role is to manage and maintain Artel infrastructure includes 100+ missed server environment (Windows/Linux/Unix), ensuring 99.99% uptime. Evaluate, monitor and enhance IT infrastructure with an emphasis on availability, reliability, scalability, data confidentiality and system Integrity.

Provide phone support for 300+ users, resolving issues related to VPN, VDI, VOIP, Lync, shared drives, applications, and local printers.

Installed, upgrade, support and troubleshoot Enterprise Applications hosted on Windows Server 2008/2012 R2.

Assisted and support Transition of SharePoint 2007/WSS 3.0 to SharePoint 2010.

Administered, Patch, and monitor performance of SharePoint Farm 2010 to support over 3,000 users.

Configure, install, and maintain local printers, including driver installation and connectivity troubleshooting.

Created and manage SharePoint group and permissions for Domain users and workflow using InfoPath 2010 Forms.

Migrated VMs across hosts within a HA Cluster to perform maintenance tasks on ESXi Hosts

Use VMware vMotion to eliminate application downtime from planned server maintenance by migrating virtual machines between hosts

Deliver onsite technical support for end-user systems, troubleshooting hardware, software, connectivity issues, and network printers.

Support and manage network printers, including printer queues, shared printer access, and network printing issues.

Implementation of VDI Horizon 7 for the engineering and NOC team.

Support Artel systems setup, establishing automated server generation routines, optimizing system performance, installing upgrades/patches, establishing system monitoring and maintaining security protocols.

Manage security patching of all servers and desktop using SCCM

Responsible for LAN/WAN troubleshooting and maintain network configurations of layer 2 and 3 switching devices including Cisco 3560 and 3700 series devices, Cisco 4000 series multi-layer switches and Cisco 6500 series switches used core gateway.

Created clones from existing VMs (both Live and Powered-off) and deployed several VMs from Templates and customized their configurations as-needed.

Responsible for administration of the Solarwinds Orion version 14 Network Performance Monitoring, Application Performance Monitoring, Netflow router source monitoring, and wireless/VOIP monitoring. Supporting toolsets responsible for moves/add/changes to the operating environment, including but not limited to: server monitoring, Application monitoring, Netflow monitoring, wireless and Voice over IP monitoring, as well as documenting the monitoring request and change control documentation for Artel NOC

Create base image for both desktop and Laptop using Symantec Imagining Tools.

Provide user and application recovery and making sure full and differential backup are successful.

Manage user account administration and Microsoft office 365 account creation in Exchange for end users.

System Administrator 04/2016- 09/2016

Syneren Technology Corporation - Contract with Department of State

Configure and deploy static code analyzer tools and provide needed services to development team.

Working with respective application teams to extract/export the application code (onboarding) and other components needed for CAST AIP

Leveraged Windows/Linux systems expertise to enhance system architectures, improve performance, automate processes, validate Access Control, enforce security with FISMA/NIST principles, optimize firewall policies, troubleshoot complex service issues, and manage escalations using Remedy.

Manage delivery of the extracted code to the CAST AIP for analysis

Provide reports to the management team/CAST Governance Council on the CAST analysis results of the respective application

Work with the respective application review team to understand the results of the CAST analysis

Manage the OTRS change request process for all CAST AIP applications (create OTRS/change for the respective application changes; responsible for the transition of the changes to the respective application teams)

Provide baseline report and analysis against the new CAST report (after re-analysis) to determine the success criteria (present report to review team, management team and steering committee)

Establish and coordinate the CAST User group and schedule periodic meetings for IT

Incorporate CAST into the SDLC cycle of the application groups

Programming experience (Java, C/C++,Red Hat, LINUX)

Install and manage virtual Linux/ windows machines on VMWare ESXi version 5.5 using ISCSI shared disk

Install and configure Apache Httpd server to be used by developer and host web application and schedule cron jobs

• Install, upgrade, support and troubleshoot Web Server related problems running on JBOSS, Tomcat, IIS, Web Sphere, etc.

Tune Linux kernel using kernel parameter as requested by database engineer

Provide backup support and server administration Using Veritas backup exec

Provide users, customers and staff with technical documentation and metrics reports.

Provide analysis as directed to support to efficiently execute software code quality.

Determine when internal system support, vendor support or other technical resources should be consulted.

Develop, execute, and fix scripts to develop automation processes.

Develop and deploy script in PowerShell and visual Basic to manage windows environment, manipulate data and determine solution when necessary.

Demonstrate in making utilities sufficient to build libraries and applications modules from source code.

Communicate clearly in both verbal and written form with other team members.

Network Administrator 01/2015-04/2016

TWD & Associates Inc

Assist in establishing performance standards, Policies and Procedures for TWD &Associates Infrastructure,

Support the Implementation and setup policy on the Palo Alto network security for TWD & Associate

Knowledge on Hyper-V, ESX and ESXI Architecture, guest OS installation, setting Up VM Priorities, Template, cloning and snapshot.

Knowledge and understanding of VMware storage and networking concepts like of Shared ISCSI and LUN (SAN or NAS), VSwitches, different type of port Groups, Nic Teaming and Vlan

Maintain both VMware VSphere 5 and Hyper-V Storage Replication and support vSphere infrastructure for multiple locations

Troubleshoot LAN/WAN systems to maintain Windows/Linux operation integrity and coordinate efforts with vendors for upgrades and network maintenance

Knowledge of PowerShell and batch file

Support all LAN-based Appliance including routers, switches, firewalls, ASA(VPN), VOIP, AVAYA, Palo Alto, TMS, Cisco C20, and Ethernet Technology

Perform general LAN administration for technical support, software and hardware changes

Administrator a network of over 500 workstations and over 100 servers both windows and Linux based operating system

Managed Users Permissions using Active Directory in SharePoint 2010 farm

Configure and Administer RSA licenses for soft and hard tokens for all remote users.

Troubleshoot network outage and provide root cause and recommendation to the clients

Use Solar Winds, Cisco Prime and IT Tracker to monitor both systems and Network appliance within TWD Infrastructure.

Assess system and network requirements for implementing and maintaining hardware, software and Telecommunications solutions to provide required network infrastructure and service levels

Manage network account, network rights, access to extensive complex systems, and equipment

Support Windows 2003/08/12

Support Exchange 2010 and Lync 2013

Migrated users from Exchange 2003 to Exchange 2010 using exchange migration utility

Create exchange users, configure space quote limits, access rights and various other functions

Configure and setup Servers on EMC SAN, Database Server, Dell Open Manager, SCCM 2012, IIS Server, SharePoint, Backup Exec, and deploy Norton Antivirus 12.0 to all the systems.

Using SCCM to manage software distribution projects includes Microsoft security upgrades and standard desktop software on global basis. Prioritize and coordinate security patch and software testing schedules and distributions.

Create packages collections, and advertisements for distributions. Tracked penetration and analysis of distributions to meet service level Agreements.

Install configured and troubleshoot VMware performance and tuning issues

Created a standard Windows 7 and 10 Image for desktop and laptops using Symantec ghost solution suite 3.1

Assess and resolve application compatibility issues with windows 7 or 10 as well as Initial training of end user for windows 7 or 10

Install and test several Dell laptops and desktops with windows 7 and 10 Image

Plans and schedule the installation of new or specialized hardware, operating system and applications software, troubleshoot operating systems, laptops and desktop issues

Plan and deploy applications and update to window 7 and 10 client computers and create and implements FDCC settings including logon and GPO

Create DFS replications in Remote sites

Rack Hardware equipment including Server, backup tapes, Router, Switches and keep up hardware inventory

Network Engineer 05/2014-11/2014

Andrew Base Air Force

Responsible for LAN and Wan network operations

Establish and maintain network performance by building network configuration and connections

Troubleshoot network issues

Perform general LAN administration by technical support

Setup Cisco Prime for network device monitoring

Setup TFTP server to backup

Install, configure, monitor, and troubleshoot of routing technologies: OSPF, EIGRP, BGP, RIP, and MPLS

Configure and troubleshoot LAN switching through protocols: VLAN, Inter VLAN Routing, VTP, STP, HSRP Redundancy, RSTP, Trunking, L2 and L3 Ether Channel

Support security technologies: IPsec, VPN, SSL VPN, ASA Firewall

Support the installing of VOIP using Cisco CUCM on VOIP Phone 7941 and 79620

Network troubleshooting using Wireshark, Ping, Traceroute, and Telenet

System Administrator 07/2011-04/2014

AAC - Department for Justice

Responsible for providing technical and administrative support to resolve customer service request.

Active Directory: group policy, user account administration and Remote access

Handle advanced Windows NT/2000/03/08 R2/12 server and client operating system related trouble calls, such as login errors, mail connectivity, trusts, wide area connectivity, name resolution issues, and server problems

Manage shared network printers, including configuration, access permissions, and troubleshooting.

Provides administration of local and wide area networks (LAN/WAN)

Troubleshoot LAN and other network related problems, monitor and support local area network related to hardware and software changes

Managed Users Permissions using Active Directory in SharePoint 2010 farm

Managed Site collections, configure security, created sites, list, libraries and configure site features in SharePoint 2010

Manage shared storage drives including access control, mapping, and user permissions.

Advised and Instructed personnel on the use of the directorate SharePoint Portal

Setup switches, router, and prepare them for labs and production environments

Support printer and network resource availability, ensuring minimal downtime and quick issue resolution.

Upgrade numerous switches and routers IOS using TFTP server

Set up TFTP server to backup and restored configuration and IOS image files for the Cisco router and switches

Maintain the physical network file server, desktop and laptop workstations and applications

Perform day-to-day client account management, adding, deleting, and modifying user accounts and Exchange user mailboxes

Assist users with VPN client installation and troubleshoot connectivity issues for both onsite and offsite users

Load and configure Microsoft Windows OS and server platforms

Install and Configure Citrix XenApp, VDI, and Applications

Maintain 70 XenApp servers with 500 concurrent users

Provide Citrix administrations such as migration and patch management on the Citrix server

Provide Citrix support to end users

Assist with the management network printers, and scanners

Maintain printer connectivity across the network to ensure reliable printing services for users.

Work closely with engineers to architect, develop and optimize the mobile Infrastructure for DOJ and create security and device management policies to better support the new MDM deployment.

Remote Access Administrator 12/2007-01/2012

IT Solutions

Handle advanced Windows NT/2000/2003 server and client operating system related trouble calls, such as login errors, mail connectivity, trusts, wide area connectivity, name resolution issues, and server problems

Manage the implementation and operation of a mobile device management solution, which included server-based installation and management, patches and upgrades.

Manage third party MDM Vendors to ensure compliance with SLAs.

Troubleshoot user blackberry and Mobile deviceon both Bes and Airwatch (MDM) to resolve user blackberry or Mobile device issues and if needed involve Vendor.

Establish a list of approved devices, create an online registration system and process Move/add/delete changes for the IRM/DOS employees.

Configure and use Internet browser technology and the full array of TCP/IP and Windows utilities, to locate and correct most network and server problems

Install workstation and server operating systems, applications, and server software (Citrix MetaFrame, WinMagic, and SafeNet) service packs, hot fixes, and special software patches

Diagnose and correct NT Terminal Server and Citrix Metaframe server issues

Perform day-to-day client account management, adding, deleting, and modifying user accounts and Exchange user mailboxes

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