Senior Linux Systems Administrator (30+ Years)

Matthew Cook

410-***-**** • ********@*******.*** • Pocomoke City, Maryland

Summary

Senior Linux Systems Administrator with 30+ years of experience administering mission-critical production environments and complex hybrid infrastructure. Expert in systems integration, networking fundamentals (DNS, DHCP, NTP), and automation across diverse platforms including Ubuntu, RHEL, and AIX. Proven ability to debug complex system issues and document robust operational procedures to ensure 100% reliability for next-generation AI cloud infrastructure.

Work Experience

Sr. Linux System Administrator February 2020 – September 2025

KBR, HOUSTON, TEXAS

Administered mission-critical production environments for a cleared project while maintaining an Active Secret Clearance.

Managed complex hybrid infrastructure including stand-alone and virtualized servers (ESXi and Hyper-V) running Ubuntu 22.04/24.04, Oracle, and RedHat Linux.

Integrated and debugged enterprise tools including Graylog (Filebeat), SentinelOne, and BigFix to provide robust automation for reporting and patching.

Documented and implemented security hardening processes for Linux distributions to ensure systems integration with strict security standards.

Resolved Tier 2 technical issues and established pre-installation test environments for software validation and complex troubleshooting.

Sr. AIX System Administrator January 2017 – December 2019

NEWGEN TECHNOLOGIES, FULTON, MARYLAND

Administered high-availability production systems for cleared projects with Top Secret Clearance.

Debugged and managed IBM/AIX P7 systems and VIO Servers, ensuring reliability across data center operations.

Collaborated with vendors to integrate system and application software, enhancing stability for mission-critical hardware.

Documented AIX installation and upgrade procedures and managed disaster recovery protocols utilizing TSM and SYSBACK.

AIX System Administrator January 2015 – December 2016

NEWGEN TECHNOLOGIES, FULTON, MARYLAND

Administered mission-critical IBM systems in a Top Secret environment, focusing on systems integration and production stability.

Established test environments to validate systems integration and debug software prior to deployment.

Sr. AIX System Administrator January 2016 – December 2019

INFOZEN, BETHESDA, MARYLAND

Administered Secret-cleared projects, providing systems integration and support for AIX P7 and VIO Servers.

Resolved hardware and software bottlenecks through vendor collaboration and system optimization.

Documented procedures and managed high-reliability backups with TSM and mksysb.

Sr. AIX System Administrator January 2016 – December 2016

AETEA, BETHESDA, MARYLAND

Administered AIX systems, debugged operational issues, and optimized Tier 2 support workflows.

Integrated vendor solutions and documented technical procedures for cleared project environments.

AIX System Administrator January 2010 – December 2014

L-3 COMMUNICATIONS, RESTON, VIRGINIA

Administered Top Secret cleared AIX P5 systems within mission-critical production environments.

Resolved data storage and Oracle Web Server issues, ensuring continuous availability of data center operations.

Consulting I/T Specialist – SP System Administrator January 2000 – December 2010

IBM CORPORATION, BETHESDA, MARYLAND

Administered SP systems and configurations for high-security cleared projects, ensuring robust systems integration.

Resolved operational stability issues for the Census Bureau through technical documentation and system debugging.

AIX/SP2 System Administrator January 1999 – December 2000

TIDAL ZONE ASSOCIATES, LANDOVER, MARYLAND

Administered multi-node IBM/AIX/SP2 systems for the Census Bureau, focusing on reliability and systems integration.

Managed high-availability backups and documented system setup procedures for mission-critical disaster recovery.

AIX/SP2 System Administrator January 1991 – December 1999

US WEST COMMUNICATIONS, DENVER, COLORADO

Administered Corporate Data Warehouse node clusters, ensuring 24/7 availability for production data storage.

Resolved complex networking fundamentals issues involving FDDI, Ethernet, and ESCON to maintain system connectivity.

Education

Continuing Education January 2023

Continuing Education

Additional Skills

Core Systems Administration: Linux, Ubuntu (22.04, 24.04), Oracle Linux, RedHat Linux (RHEL), AIX (6.1, 7.1), VIO Servers

Networking & Protocols: Networking Fundamentals, DNS, DHCP, NTP, FDDI, Ethernet, ESCON

Automation & Integration: Automation, Systems Integration, Shell Scripting, Python (Automation), BigFix, Filebeat

Infrastructure & Monitoring: Hybrid Infrastructure, Data Center Operations, ESXi, Hyper-V, Graylog, SentinelOne, TSM, SYSBACK

Security & Operations: Security Hardening, Disaster Recovery Planning, Debug, Resolve, Document, Administer

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