KRYSTOPHER HOLLOWELL
WOODBRIDGE
Summary
Results-driven IT professional with notable success in planning, analysis and implementation of security initiatives. Strengths in providing comprehensive network design and security frameworks. Certified in Area of certification.
IT professional with Number years of experience developing and implementing security solutions in fast-paced environments. Skilled in Skill and Skill with proven history of delivering exceptional risk management support.
Experienced with network security, threat analysis, and incident response. Utilizes analytical skills to fortify systems against potential breaches. Strong understanding of risk management and proactive security measures.
Tech-savvy innovator with hands-on experience in emerging technologies and passion for continuous improvement. Skilled in identifying opportunities for technological enhancements and implementing effective solutions. Adept at leveraging new tools and methods to solve problems and enhance productivity. Excels in adapting to fast-paced environments and driving technological advancements.
Overview
15
15
years of professional experience
1
1
Certification
Work History
System Admin II / JR Cyber Security Engineer
Gromelski & Associates
11.2023 - Current
- Perform continuous vulnerability assessments using tools such as Nessus, OpenVAS, or ACAS to identify security gaps and misconfigurations.
- Analyze vulnerability findings, assign risk scores, and collaborate with system owners to implement mitigation strategies.
- Monitor SIEM platforms (Splunk, Elastic, QRadar, etc.) to detect suspicious activity, unauthorized access attempts, and system anomalies.
- Assist in triaging, documenting, and escalating security incidents following established incident response playbooks.
- Conduct root-cause analysis and support forensic collection under guidance from senior analysts.
- Maintain and update security baselines, STIG compliance checks, and system hardening configurations.
- Review audit logs across Linux, Windows, and network devices to ensure adherence to organizational security policies.
- Contribute to risk assessments, POA&Ms, and compliance documentation required for DoD/NIST environments.
- Participate in security patch cycles, validating patch impact and assisting with deployment scheduling.
- Apply Zero Trust principles such as least privilege, micro‑segmentation, and continuous verification across systems.
- Support identity‑centric security by enforcing MFA, strong authentication workflows, and conditional access policies.
- Assist with implementing network segmentation and secure access controls for users, devices, and applications.
- Monitor and validate user/device trust scores using Zero Trust-aligned tools and logging mechanisms.
- Participate in configuration and enforcement of Zero Trust access policies across cloud and on‑prem environments.
- Support endpoint protection technologies, ensuring AV, EDR, and behavioral tools remain operational and updated.
- Design, develop, integrate and test analog designs.
- Model and simulate to optimize designs and to incorporate design margins.
- Perform design analysis, technology assessments, and trade studies.
- Specify and select COTS, ROTS, NDI and / or custom components.
- Linux red Hat environments.
- Jinkins environment to monitor projects and task. Produce written guides and operational procedures on how to utilize specific software tools to include custom Linux scripts.
- Developed small custom software in Apache Puppet and Chef for task automation.
- Manage and monitor all installed systems and infrastructure.
- Install, configure, test, and maintain operating systems, application software and system management tools.
- Perform electrical and system engineering tasks for present and future US Navy submarine imaging periscope systems.
- Researched, developed, designed, and tested electrical components, equipment, systems, and networks.
- Maintain security, backup, and redundancy strategies.
- Write and maintain custom scripts to increase system efficiency and lower the human intervention time on any tasks.
Systems Engineer
TEKsystems
09.2022 - 11.2023
- Install, configure, and troubleshoot UNIX /Linux based environments.
- Administer performance tuning of application stacks (e.g., Tomcat, JBoss, Apache, Ruby, NGINX).
- Supports client AWS cloud environment.
- Examines Linux logs ensuring optimal performance of the Oracle Identity and Access Management stack.
- Maintain user groups and objects in LDAP system directory.
- Experience with virtualization and containerization (e.g., VMware, Virtual Box).
- Proactively monitors the health and integrity of client production systems using system reporting tools, ensuring the client’s mission operations remain uninterrupted.
- Proactively ensure the highest levels of systems and infrastructure availability.
- Designed and implemented custom monitoring utilities written from batch/shell scripts (PowerShell, Python and MS DOS).
- Produce written guides and operational procedures on how to utilize specific software tools to include custom Linux scripts.
- Developed small custom software in Apache Puppet and Chef for task automation.
- Manage and monitor all installed systems and infrastructure.
- Install, configure, test, and maintain operating systems, application software and system management tools.
- Initiate Technical Exchange meetings among enterprise operation teams (Tier 1 and Tier 3 engineers) for troubleshooting and root cause analysis while maintaining persistent communication with End Users, executive leadership, and mission partners of system outages and mission impacts.
Helpdesk Analyst (Short Contract)
COGNOSANTE
02.2022 - 09.2022
- Assisted and supported over 10,000 users and satellite sites through SMS system.
- Assisted in creating technical SOPs for usage of operating systems.
- Received customers incoming support calls for assistance and noted issues in BMC Remedy ticketing system.
- Supported and managed customers’ requests for Health Care enrollment, email, and network assistance.
- Created new user domain and email accounts using Active Directory.
- Installed software through SMS 50+ machines.
- Troubleshoot software issues (Word, PowerPoint, and Excel), troubleshoot peripherals, install, and configure Hewlett Packard printers (local and network), install, and configure Microsoft Office 2010.
- Produce written guides and operational procedures on how to utilize specific software tools to include custom Linux scripts.
- Tracked IT assets in Service desk database and updated the report monthly.
- Diagnosing and resolving technical issues with hardware or software systems.
- Speaking with users over the phone, in person or via online chat to understand and troubleshoot technical issues.
- Determining the need for and subsequently providing system reconfiguration.
- Assessing user needs and recommending technical solutions such as patches, upgrades, or enhancements.
- Documenting technical support procedures and maintaining customer records.
- Responding promptly to queries and providing information on the proper installation, maintenance, and use of technical systems.
- Completing thorough installations in the client environment by taking backups of data, upgrading systems as needed and installing new software or hardware solutions.
Assistant Operations Manager
EPIQ FOOD HALL
07.2021 - 09.2022
- Developed a productive, profitable and achievement-oriented working environment for employees.
- Addressed operational issues and concerns in a timely fashion.
- Supervised operations team to ensure operational excellence and excellent customer services.
- Educated operations team on best practices, company policies and service excellence standards.
- Developed and maintained operational guidelines for staff.
- Oversaw operational cost, risk, and audit activities.
- Assisted in interviewing, recruiting, training, performance evaluation, promotion, and termination activities.
- Determined staffing requirements, work assignments and schedules for new projects.
- Performed routine maintenance and repair works for equipment.
- Evaluated inspection reports and service tickets and prepared repair invoices.
- Coordinated with the General Manager in different operational issues and promotional activities.
- Evaluated current operational strategies and recommended improvements.
- Generated operational reports for management as needed.
- Troubleshoot Pos systems.
- Monitored network flows on juniper switch.
- Maintained system accounts and passwords.
- Installed new applications and equipment to help enhance customer satisfaction.
- Troubleshoot network routers, modems.
Systems Engineer
WIPRO/LINKEDIN
05.2018 - 09.2022
- Experience in installing, configuring, and troubleshooting UNIX /Linux based environments.
- Solid experience in the administration and performance tuning of application stacks (e.g., Tomcat, JBoss, Apache, Ruby, NGINX).
- Experience with virtualization and containerization (e.g., VMware, Virtual Box).
- Experience with monitoring systems.
- Coordinate with other technical teams on system outages and make decisions on system failover to different availability zones or data centers.
- Produce written guides and operational procedures on how to utilize specific software tools to include custom Linux scripts.
- Analyze Linux log data to effectively administer and maintain Oracle Identity and Access Management stack.
- Experience with automation software (e.g., Puppet, Chef).
- Provide scripting support (e.g., shell scripts, Perl, Ruby, Python).
- Maintained user groups and objects in LDAP system directory.
- Manage and monitor all installed systems and infrastructure.
- Install, configure, test, and maintain operating systems, application software and system management tools.
- Proactively ensure the highest levels of systems and infrastructure availability.
- Monitor and test application performance for potential bottlenecks, identify possible solutions, and work with developers to implement those fixes.
- Maintain security, backup, and redundancy strategies.
- Write and maintain custom scripts to increase system efficiency and lower the human intervention time on any tasks.
- Participated in the design of and implementation of operational support systems.
- Provided Tier 2 and Tier 3 level technical support to end users.
- Liaise with vendors and other IT personnel for problem resolution.
Data Center Technician
AMAZON
09.2019 - 07.2021
- Complete preventative maintenance of about 1500+ servers maintaining company compliance.
- Set up and maintain equipment and data network devices.
- Ran cables and improved physical security around the data center. Resulting in consistent network uptime.
- Completed building projects and checked utilities to make sure the center did not overheat, carefully examining power sources and heating and cooling controls.
- Produce written guides and operational procedures on how to utilize specific software tools to include custom Linux scripts.
- Analyze Linux log data to effectively administer and maintain Oracle Identity and Access Management stack.
- Repair servers that have hardware and network issues, run hardware diagnostics and replace failing parts.
- Responsible for day-to-day performance and capacity management of servers.
- Managed workload and request using ServiceNow ticketing system.
- Provided virtual and deskside support for server maintenance.
- Coordinate with enterprise partners on system outages and make decisions on system failovers to different availability zones or data centers.
- Move decommissioned racks out of slots to provide constant network run time and performance.
- Manage asset tagging and recording resulting in 100% inventory compliance.
Data Center Technician
Metro Systems
08.2017 - 09.2019
- Complete preventative maintenance of about 500+ servers maintaining company compliance.
- Set up and maintain equipment and data network devices.
- Ran cables and improved physical security around the data center.
- Completed building projects and checked utilities to make sure the center did not overheat, carefully examining power sources and heating and cooling controls.
- Produce written guides and operational procedures on how to utilize specific software tools to include custom Linux scripts.
- Repair servers that have hardware and network issues, run hardware diagnostics and replace failing parts.
- Responsible for day-to-day performance and capacity management of servers.
- Coordinate with enterprise partners on system outages and make decisions on system failovers to different availability zones or data centers.
- Managed workload and requests within ticketing system.
- Provided virtual and deskside support for server maintenance.
Desktop Support
THERMO FISHER
03.2015 - 08.2017
- Provided front-line primary technical support to end users on various technical issues and problems relating to hardware, software, and peripherals.
- Monitored and responded to 50+ tickets daily resulting in 100% SLA satisfaction.
- Installed Windows XP up to Windows 10 on over 200 PC’s.
- Subnet a Class C network ID to provide 5 subnets, each subnet supporting 30 hosts.
- Produce written guides and operational procedures on how to utilize specific software tools to include custom Linux scripts.
- Configured network, using a 2960 Catalyst switch, Windows Server 2008, and Windows 7 by applying appropriate configurations.
- Created organizational units, user accounts, groups, and assigned NTFS permissions.
- Monitored and patched up to 125+ systems on segregated networks resulting in IAVM compliance.
- Installed Virtual-box and created multiple VMs and installed Windows Server 2008 R2 and Windows 7 64-bit and configured the VMs to participate in network requirements.
- Analyze Linux log data to effectively administer and maintain Oracle Identity and Access Management stack.
- Use of Service Now Ticketing system to track client’s orders as well as hardware.
- Use of Microsoft 365 to complete daily workload tracker.
- Use of TeamViewer for remote support for clients that were not on site, as well as offered desk side support for onsite clients.
Deployment Specialist
ESI (Electronic System INC.)
11.2014 - 02.2015
- Assist with project deployment for government facility (Hospital, Court System, Schools).
- Produce written guides and operational procedures on how to utilize specific software tools to include custom Linux scripts.
- Set up printer installation, troubleshooting, network mapping (hard dives printer High occupancy scanners, profile migration, reimaging) profile migration.
- Field incoming help requests from end users via both telephone and email.
- Document all pertinent end user identification information and nature of problem or issue.
- Prioritize, schedule and escalate problems to the appropriately experienced technician.
- Record, track, and document the help desk request problem-solving process.
- Apply diagnostic utilities to aid in troubleshooting.
- Analyze Linux log data to effectively administer and maintain Oracle Identity and Access Management stack.
- Access software updates, drivers, knowledge bases, and frequently asked questions resources to aid in problem resolution.
- Maintain software and hardware used and supported by the organization.
- Perform hands-on fixes at the desktop level, including installing and upgrading software, installing hardware, implementing file backups, and configuring systems and applications.
- Performing preventative maintenance, including checking and cleaning of workstations, printers, and peripherals.
- Test fixes to ensure the problem has been adequately resolved.
- Perform post-resolution follow-ups.
- Develop help sheets and frequently asked questions lists for end users.
Helpdesk Analyst
COGNASANTE
06.2012 - 12.2013
- Assist and support over 10,000 users and satellite sites through System Management Server (SMS).
- Received customers incoming support calls for assistance and documented problems into the Remedy database.
- Support and expertly handle customers’ requests for Health Care enrollment, email, and network assistance.
- Create new user domains and email accounts using Active Directory.
- Install software through SMS, troubleshoot software issues (Word, PowerPoint and Excel), troubleshoot peripherals, install, and configure Hewlett Packard printers (local and network), install, and configure Microsoft Office 2010.
- Track IT assets in PeopleSoft database and update the report monthly.
- Coordinate communications with End Users, Tier 1, Tier 3, Management, mission partners, and Government Leadership.
Helpdesk Analyst
ARAMARK
08.2010 - 06.2012
- Responsible for diagnosing, troubleshooting, and resolving client's issues with hardware maintenance, installation, peripheral equipment, and upgrades.
- Documented customer problems/solutions clearly and concisely in the Remedy help desk tool.
- Installed software through SMS remote control tool and troubleshoot software issues such as Word, Power Point, Excel, and MS Outlook.
- Configured and installed all network and local printers for users and upgraded users from Windows XP to Windows 7.
- Field incoming help requests from end users via both telephone and email in a courteous manner.
- Document all pertinent end user identification information, including name, department, contact information, and nature of problem or issue.
- Identify recurring incidents as a problem and provide RCA to support final resolution.
- Prioritize, schedule, and escalate tickets to the appropriate technicians.
- Record, track, and document the help desk request problem-solving process, including all successful and unsuccessful decisions made, and actions taken, through to final resolution.
- Access software updates, drivers, knowledge bases, and frequently asked questions resources on the Internet to aid in problem resolution.
- Coordinate communications with End Users, Tier 1, Tier 3, Management, mission partners.
- Identify and learn appropriate software and hardware used and supported by the organization.
- Perform hands-on fixes at the desktop level, including installing and upgrading software, installing hardware, implementing file backups, and configuring systems and applications.
- Performing preventative maintenance, including checking and cleaning of workstations, printers, and peripherals.
- Test fixes to ensure the problem has been adequately resolved.
- Perform post-resolution follow-ups to help requests.
- Develop help sheets and frequently asked questions lists for end users.
Sales/Installation Representative
ADT
02.2011 - 06.2011
- Process work orders and complete all related paperwork in accordance with approved and standardized procedures, including SOX documentation.
- Prepare final agreements for signatures.
- Follow up with your customers after the installation is finished to make sure all commitments are met.
- Troubleshooter and service expert responsible for alleviating concerns the customer may have regarding a security system.
- Advised customers and the customer care center of the status of systems and processes inspections.
- Locate and alleviate trouble with damaged equipment or wiring.
- Readjust equipment, repair, or replace inoperative equipment and test for operation.
- Read blueprints, building and electrical plans to complete equipment repairs.
- Prepare trouble order forms to report temporary repairs.
- Coordinate inspections and/or installations with police, fire departments, or other appropriate agencies.
Education
Bachelor of Science - Cyber Security
Strayer University
Skills
- DELL PowerEdge 1950/2600/2900/2950/R610-R730
- HP
- IBM Systems
- Cisco
- Dell Switches
- Redundant Array Individual Disk (RAID) Systems
- Basic routing
- Cisco Routers
- Dell Software
- Microsoft Server 2000-2012
- Win XP through Win 10
- Microsoft Exchange 2007
- Office 2007-2013
- Symantec Backup
- Service Now
- Remedy
- GroupWise
- Adobe Suites
- Netscape
- Norton
- Webroot
- McAfee
- Certified Honeywell Security Monitoring System Security Motion Sensors
- Mobile Device
- Support
- PowerShell
- Oracle
- Active Directory
- Virtual Box
- Outlook
- VPN Tokens
- Team Viewer
- Information Assurance Vulnerability Management
- System Management Server (SMS)
- Common Access card (CAC)
- Microsoft office 365
- Skype
- Zoom
- Transmission Control Protocol/Internet Protocol (TCP/IP)
- Virtual Private Network (VPN)
- MDM
- AirWatch
- MacOS
- Linux
- Jira
- Putty
- AzureVM
- Vulnerability assessment
- Incident response
- Security compliance
- Risk analysis
- Network segmentation
- Endpoint protection
- System hardening
- Automation scripting
- UNIX/Linux administration
- Configuration management
- Technical documentation
Certification
- CompTIA Security+ ce
- CompTIA Security X
Clearance
Active Top Secret
Timeline
System Admin II / JR Cyber Security Engineer
Gromelski & Associates
11.2023 - Current
Systems Engineer
TEKsystems
09.2022 - 11.2023
Helpdesk Analyst (Short Contract)
COGNOSANTE
02.2022 - 09.2022
Assistant Operations Manager
EPIQ FOOD HALL
07.2021 - 09.2022
Data Center Technician
AMAZON
09.2019 - 07.2021
Systems Engineer
WIPRO/LINKEDIN
05.2018 - 09.2022
Data Center Technician
Metro Systems
08.2017 - 09.2019
Desktop Support
THERMO FISHER
03.2015 - 08.2017
Deployment Specialist
ESI (Electronic System INC.)
11.2014 - 02.2015
Helpdesk Analyst
COGNASANTE
06.2012 - 12.2013
Sales/Installation Representative
ADT
02.2011 - 06.2011
Helpdesk Analyst
ARAMARK
08.2010 - 06.2012
Bachelor of Science - Cyber Security
Strayer University