Linux & Middleware Administration

Sun Technologies, Inc.; Mason (OH); On-site; USD 75,000 - 107,000; Full time

Benefits offered by this job

Medical Insurance in compliance with/-

Job summary

Sun Technologies, Inc. is seeking an experienced Linux and middleware administrator for a 1–2 month contract in Mason, Ohio. You will manage RHEL environments, configure and troubleshoot Apache, Docker, NGINX and JBoss EAP, and assist with JVM tuning and deployments.

The role involves analyzing logs, supporting SSL certificates, collaborating with development and DevOps teams, and coordinating with Networking and Security to ensure reliable deployments.

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.

Responsibilities

• Administer, maintain, patch, monitor, and troubleshoot Linux environments, preferably RHEL.
• Install, configure, maintain, and troubleshoot Apache HTTP Server, Docker, NGINX, and Red Hat JBoss 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.
• 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.
• 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.
• Possess a solid understanding of networking concepts including TCP/IP, DNS, routing, firewalls, ports, load balancing, SSL/TLS, NAT, and network connectivity.
• 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.

Skills

Linux administration

Networking fundamentals

Incident response

Documentation

Collaboration

Tools

Red Hat Enterprise Linux (RHEL)

Apache HTTP Server

Docker

NGINX

JBoss EAP

Git

CI/CD

OpenSSL/curl/nslookup

Job description

Location

• : Mason
• , Ohio

: Expected 1-2 month contract with possible extension

Job Description

Pay Rate: $66/hr the pay rate may differ depending on your skills, education, experience, and other qualifications.

Featured Benefits:

• Medical Insurance in compliance with the ACA
• 401(k)
• Sick leave in compliance with applicable state, federal, and local laws

Job Description

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