Engineering

Castillians

. Install, configure, administer, and maintain Red Hat Enterprise Linux (RHEL) environments .

Posted 10/27/2026contractRemote • IrelandMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in Linux System Administration, particularly with Red Hat Enterprise Linux, including system performance optimization, security hardening, and automation using Ansible and scripting languages. Proficient in managing infrastructure deployments, troubleshooting technical issues, and collaborating with cross-functional teams to ensure operational compliance and reliability.

Highest-signal resume keywords

Linux System AdministrationRed Hat Enterprise LinuxAnsible AutomationBash ScriptingRed Hat Certified System Administrator (RHCSA)

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Linux System AdministrationSystem Performance OptimizationSecurity HardeningInfrastructure AutomationBash ScriptingPython ScriptingSystem PatchingTroubleshootingConfiguration ManagementNetworking Fundamentals

Soft Skills

Analytical SkillsProblem-Solving SkillsCommunication SkillsCollaboration SkillsIndependence

Tools & Technologies

Red Hat SatelliteRed Hat Identity Management (IdM)DockerKubernetesRed Hat OpenShift

Certifications & Qualifications

Red Hat Certified System Administrator (RHCSA)Red Hat Certified Engineer (RHCE)

Industry Keywords

Infrastructure EngineeringDevOpsSystem Performance MonitoringDisaster RecoveryOperational Compliance

Tech Stack

Tools & technologies

AnsibleCloudDNSDockerKubernetesLinuxOpenShiftPython

About the role

Key responsibilities & impact

Install, configure, administer, and maintain Red Hat Enterprise Linux (RHEL) environments
Monitor system performance, troubleshoot technical issues, and implement improvements to maintain system availability and reliability
Perform system patching, upgrades, security hardening, and vulnerability remediation
Automate infrastructure administration and configuration tasks using Ansible and scripting languages
Manage system services, user accounts, permissions, storage, and access controls
Support infrastructure deployments, migrations, backup and recovery, and disaster recovery procedures
Configure and maintain network services, including DNS and DHCP, where required
Support system provisioning, patch management, and lifecycle management using relevant infrastructure tools
Collaborate with infrastructure, cloud, network, and security teams to resolve incidents and support operational requirements
Document system configurations, operational procedures, and technical solutions
Follow best practices for system security, infrastructure maintenance, and operational compliance
Submit a professional profile or CV
Attend a 30-minute virtual business alignment discussion
Attend a direct interview with the end client

Requirements

What you’ll need

At least 5 years of experience in Linux system administration, systems engineering, infrastructure engineering, DevOps, or a similar role
Hands-on experience administering Red Hat Enterprise Linux environments
Good knowledge of Linux system architecture, configuration, troubleshooting, and performance optimisation
Experience with system patching, upgrades, and security hardening
Familiarity with Ansible and infrastructure automation
Experience with Bash or Python scripting for administrative tasks
Understanding of networking fundamentals, DNS, DHCP, storage, and access management
Ability to troubleshoot infrastructure issues and support service-level requirements
Strong analytical, problem-solving, and communication skills
Ability to work independently and collaborate effectively with technical teams
Red Hat Certified System Administrator (RHCSA), Red Hat Certified Engineer (RHCE), or equivalent certifications
Experience with Red Hat Satellite and Red Hat Identity Management (IdM)
Familiarity with virtualisation technologies and cloud infrastructure
Knowledge of Docker, Kubernetes, or Red Hat OpenShift
Experience with enterprise infrastructure automation and configuration management
Must complete the Castille Vetting process, including applicable background and compliance checks
Must attend a direct interview with the end client
Must complete a project-specific technical assessment, if required

Benefits

Comp & perks

Remote working arrangement with a project-based B2B engagement
Opportunity for repeat engagements based on performance and project requirements
Access to professional network insights and ongoing business support
Access to professional guidance, network connections, and relevant market insights
Possible extension after the initial 6-month engagement