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Linux Admin

CTC USA, LLCMason, OH🇺🇸United States

Quick overview

SeniorityMid Senior
Work modeOn Site
LocationMason, OH, United States
DockerOracleGitLoad BalancingNginxSplunkTCP/IPAnsibleApacheBashDNSHTTPJavaJenkinsPythonJiraCI/CDLinux

Job description

ACTUAL JOB TITLE: Linux & Middleware Administration
Hybrid - 3x onsite - Mason, OH
Duration: 12/31/2026 - extension in process for 2027
Key Responsibilities
Linux & Middleware Administration
  • Administer, maintain, patch, monitor, and troubleshoot Linux environments, preferably Red Hat Enterprise Linux (RHEL).
  • Install, configure, maintain, and troubleshoot Apache HTTP Server, Docker, NGINX, and Red Hat JBoss Enterprise Application Platform (EAP).
  • Support JBoss configurations including JVM settings, application deployments, data sources, certificates, logging, clustering, and environment-specific configuration.
  • Analyze system and application logs to identify performance, configuration, connectivity, and availability issues.
  • Support SSL/TLS certificates, keystores, truststores, and related application connectivity.
Java Application Support
  • Possess a working knowledge of Java/Jakarta EE applications and be able to review Java code, stack traces, configuration files, and logs to assist with troubleshooting.
  • Work closely with development teams to diagnose application, JVM, middleware, and infrastructure-related problems.
  • Troubleshoot issues involving JVM memory, threads, garbage collection, connection pools, application dependencies, and service integrations.
Build & Deployment Support
  • Support and troubleshoot application build and deployment processes across development, test, and production environments.
  • Assist in diagnosing failed builds, deployment failures, configuration issues, dependency problems, permissions, and environment differences.
  • Understand modern CI/CD concepts, Git-based source control, build pipelines, and release processes.
  • Partner with Development and DevOps teams to improve deployment reliability and reduce manual intervention.
Networking & Infrastructure Coordination
  • Possess a solid understanding of networking concepts including TCP/IP, DNS, routing, firewalls, ports, load balancing, SSL/TLS, NAT, and network connectivity.
  • Understand VIPs, load balancers, firewall rules, and site-to-site (S2S) VPNs well enough to identify requirements and submit accurate network requests.
  • Troubleshoot application connectivity using tools such as curl, openssl, nslookup/dig, traceroute, netstat/ss, and related Linux utilities.
  • Partner effectively with Network and Security teams to diagnose connectivity issues and implement infrastructure changes.
Required Qualifications
  • 5+ years of Linux systems administration or equivalent enterprise infrastructure experience.
  • Strong hands-on experience with Red Hat Enterprise Linux (RHEL) or comparable Linux distributions.
  • Experience administering and troubleshooting Apache HTTP Server.
  • Experience administering and troubleshooting Red Hat JBoss EAP.
  • Working knowledge of Java/Jakarta EE applications, including the ability to interpret application logs, stack traces, JVM errors, and basic Java code.
  • Experience troubleshooting application builds and deployments.
  • Understanding of Git, CI/CD pipelines, and automated build/deployment processes.
  • Strong networking fundamentals and the ability to translate application requirements into well-defined network requests.
  • Experience troubleshooting complex issues that span application, middleware, operating system, database connectivity, and network layers.
  • Strong communication and documentation skills with the ability to collaborate across Development, Infrastructure, Network, Security, and Operations teams.
Preferred Qualifications
  • Experience with Jira for incident, change, problem, and work tracking.
  • Experience with GitLab, Jenkins, Ansible, or similar CI/CD and automation technologies.
  • Experience supporting highly available, business-critical enterprise applications.
  • Familiarity with load-balancing technologies such as F5 BIG-IP.
  • Experience with monitoring/APM platforms such as Dynatrace, Splunk, or similar tools.
  • Experience supporting applications that integrate with Oracle databases.
  • Basic scripting experience with Bash, Python, or similar technologies.
  • Prior hands-on application development experience (even small) particularly with Java-based enterprise applications, is a plus and will be valuable when troubleshooting application, build, deployment, and runtime issues.
Key Competencies
  • Strong troubleshooting and root-cause-analysis skills
  • Ability to troubleshoot across the application, middleware, OS, and network stack
  • Comfortable reviewing application code without requiring a software developer background
  • Strong ownership and follow-through
  • Ability to work effectively during production incidents and high-priority deployments
  • Strong cross-functional communication skills
  • Ability to translate technical requirements between Development and Infrastructure teams

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