Linux System Administrator

Diversity Nexus; Mason (OH); Hybrid; USD 110,000 - 150,000; Full time

Benefits offered by this job

Hybrid schedule

On-site Mason OH

Job summary

Diversity Nexus is seeking an experienced Linux & Middleware Administrator to manage enterprise Linux environments and Java-based apps in a hybrid Mason, OH environment. You will support RHEL, JBoss EAP, Apache HTTP Server, NGINX, and Docker, handling deployments, configurations, certificates, logs, and performance tuning.

You will troubleshoot JVM and application issues, coordinate with DevOps, Network, and Security teams, and contribute to building robust, scalable middleware platforms across

Qualifications

• 5+ years of Linux systems administration or enterprise infrastructure experience.
• Strong hands-on experience with RHEL or comparable Linux distributions.
• Experience administering and troubleshooting Apache HTTP Server and Red Hat JBoss EAP.
• Working knowledge of Java/Jakarta EE applications and JVM troubleshooting.
• Experience supporting application builds, deployments, and production environments.
• Understanding of Git, CI/CD pipelines, and automated deployment processes.

Responsibilities

• Administer, maintain, patch, monitor, and troubleshoot Linux servers, preferably RHEL.
• Install, configure, and support Apache HTTP Server, NGINX, Docker, and Red Hat JBoss EAP.
• Manage JBoss configurations, JVM settings, application deployments, data sources, certificates, logging, and clustering.
• Analyze system and application logs to identify performance and connectivity issues.
• Support SSL/TLS certificates, keystores, and truststores.
• Troubleshoot Java/Jakarta EE applications by reviewing application logs, stack traces, configuration files, and basic Java code.
• Diagnose JVM memory, thread, garbage collection, connection pool, and application dependency issues.
• Collaborate with development teams to resolve application and middleware-related problems.
• Build and deploy applications across development, testing, and production environments.

Skills

Linux admin

RHEL

JBoss EAP

Apache HTTP

NGINX

Java/Jakarta EE

Docker

Git CI/CD

Networking basics

Troubleshooting

Tools

GitLab

Jenkins

Ansible

Job description

Job Title: Linux & Middleware Administrator

Location: Mason, OH (Hybrid – 3 days onsite)

Start Date: Immediate

Contract Duration: Through December 31, 2026 (Extension in process for 2027)

Work Arrangement: Hybrid

Job Summary

We are looking for an experienced Linux & Middleware Administrator to manage, maintain, and troubleshoot enterprise Linux environments and Java-based applications. The ideal candidate will have strong hands-on experience with Red Enterprise Linux (RHEL), JBoss EAP, Apache HTTP Server, and Java application support.

The role involves supporting middleware configurations, application deployments, production troubleshooting, and infrastructure connectivity while working closely with Development, DevOps, Network, Security, and Operations teams.

Key Responsibilities

• Administer, maintain, patch, monitor, and troubleshoot Linux servers, preferably RHEL.
• Install, configure, and support Apache HTTP Server, NGINX, Docker, and Red Hat JBoss EAP.
• Manage JBoss configurations, JVM settings, application deployments, data sources, certificates, logging, and clustering.
• Analyze system and application logs to identify performance and connectivity issues.
• Support SSL/TLS certificates, keystores, and truststores.
• Troubleshoot Java/Jakarta EE applications by reviewing application logs, stack traces, configuration files, and basic Java code.
• Diagnose JVM memory, thread, garbage collection, connection pool, and application dependency issues.
• Collaborate with development teams to resolve application and middleware-related problems.

Build & Deployment Support

• Support application builds and deployments across development, testing, and production environments.
• Troubleshoot deployment failures, configuration issues, dependencies, and environment differences.
• Work with Git, CI/CD pipelines, and automated build and deployment processes.
• Partner with Development and DevOps teams to improve deployment reliability.

Networking & Infrastructure Support

• Understand TCP/IP, DNS, routing, firewalls, ports, load balancing, SSL/TLS, NAT, and VPN connectivity.
• Coordinate network requests involving VIPs, load balancers, firewall rules, and site-to-site VPNs.
• Troubleshoot connectivity using tools such as curl, openssl, nslookup/dig, traceroute, and Linux networking utilities.
• Work with Network and Security teams to resolve infrastructure connectivity issues.

Required Qualifications

• 5+ years of Linux systems administration or enterprise infrastructure experience.
• Strong hands-on experience with RHEL or comparable Linux distributions.
• Experience administering and troubleshooting Apache HTTP Server and Red Hat JBoss EAP.
• Working knowledge of Java/Jakarta EE applications and JVM troubleshooting.
• Experience supporting application builds, deployments, and production environments.
• Understanding of Git, CI/CD pipelines, and automated deployment processes.
• Strong networking fundamentals and application connectivity troubleshooting skills.
• Ability to troubleshoot across application, middleware, operating system, database connectivity, and network layers.
• Strong communication, documentation, and problem-solving skills.

Preferred Qualifications

• Experience with Jira for incident, change, and problem management.
• Familiarity with GitLab, Jenkins, Ansible, or similar automation tools.
• Experience supporting highly available, business-critical applications.
• Knowledge of F5 BIG-IP load balancers.
• Experience with Dynatrace, Splunk, or similar monitoring/APM tools.
• Basic scripting knowledge in Bash, Python, or similar languages.
• Prior Java application development experience is an advantage.
• Strong troubleshooting and root-cause analysis skills.
• Ability to work across Linux, middleware, application, and network layers.
• Ability to review application code and identify technical issues.
• Strong ownership and follow-through.
• Ability to support production incidents and high-priority deployments.
• Effective communication and collaboration across technical teams.
• Ability to translate application requirements into infrastructure and network requests.