Linux Application Administrator

Galapagos Federal Systems LLC.

5d•$95,000 - $116,000

About The Position

Galapagos Federal Systems LLC is seeking a motivated Linux Applications Administrator to join our team and work alongside a diverse group of talented professionals dedicated to mission success. The Linux Applications Administrator provides application administration support for Linux-hosted applications within the Defense Travel Management Office (DTMO) Enterprise Infrastructure. This role is responsible for the lifecycle management of Government Off-The-Shelf (GOTS) and Commercial Off-The-Shelf (COTS) applications, including installation, testing, deployment, troubleshooting, updates, logging, and patching. The administrator serves as the Subject Matter Expert (SME) for DTMO supported Linux applications, supporting users and IT leadership. Key technologies include Red Hat Enterprise Linux, Apache, Tomcat, LDAP, Oracle Unified Directory, Red Hat Single Sign-On, and Splunk. Responsibilities also include monitoring the DTMO Passport website and applications during core business hours (0600–2200 ET, Monday–Friday) and providing on-call support for critical incidents outside those hours. The role works closely with DMDC IT System Administrators, supports disaster recovery testing, participates in Governance Board activities, and follows ITIL best practices for incident management and root cause analysis.

Requirements

Must obtain and maintain a Tier 3 (T3) or higher background investigation
5+ years of experience in Application Administration
Experience administering Linux-based applications in enterprise or government environments
Strong knowledge of Linux operating systems such as Red Hat Enterprise Linux (RHEL), CentOS, or Ubuntu
Experience with application installation, configuration, patching, and lifecycle management
Familiarity with Linux command-line tools, system services, and shell scripting
Experience with system monitoring, performance tuning, and troubleshooting techniques
Knowledge of network services, file systems, and system security practices within Linux environments
Experience supporting change management and system updates in production environments
Ability to diagnose and resolve application issues in coordination with system administrators and developers
Strong analytical and problem-solving skills
Ability to work collaboratively with cross-functional IT teams and federal stakeholders
Experience with Apache web server
Experience with Tomcat application server
Experience with LDAP and Oracle Unified Directory
Experience with Red Hat single sign-on
Experience with Splunk technology for application management, security, and compliance
Experience with SaaS, PaaS, and cloud platforms
Strong written and verbal communication skills
Bachelor's degree in information technology, Computer Science, Information Systems, or related fields. ( Red Hat Linux Certified System Administrator certification can be used in place of a bachelor's degree)

Nice To Haves

Red Hat Certified System Administrator (RHCSA)
Red Hat Certified Engineer (RHCE)
CompTIA Linux+
Relevant professional experience in Linux systems or application administration may substitute for formal education in some cases.

Responsibilities

Install, test, deploy, debug, update, and patch DTMO GOTS and COTS applications on Linux platforms
Troubleshoot application concerns and respond to inquiries from application users
Support logging software that captures security events and feeds into DMDC-approved software
Configure user access and monitor system stability and security through the software development life cycle
Coordinate with DMDC IT System Administrators to resolve infrastructure-related issues
Perform application maintenance, review error logs, and resolve reported errors
Provide technical support and guidance to DTMO users and IT managers
Support setting up external connections, whitelisting activities, port and protocols, submission requests, and validations
Ensure application and DTMO Passport website monitoring during core hours (0600 to 2200 Eastern Time, Monday through Friday) and on-call basis for mission-critical incidents at all other times
Coordinate with DMDC to develop and maintain technical documents such as network diagrams, standard operating procedures, and ports and protocols lists
Support Governance Board processes including documentation development, change request review, level of effort estimates, impact assessments, and stakeholder coordination
Coordinate with DMDC to support disaster recovery tests to reinstate DTMO Passport website
Restore normal operation after incidents, prepare root cause analysis, and apply ITIL best practices