Middleware Administrator- Irvine, CA

Job Description

Middleware Administrator - Irvine, CA (Local, 100% Onsite) – 12‑month contract.

• Lead middleware migration activities – support the migration of Java‑based enterprise applications from one data center to another, ensuring application servers, configurations, dependencies, and runtime environments are correctly transitioned.
• Install, configure, administer, and support IBM Web Sphere Application Server and JBoss environments, including deployments, JVM settings, clusters, nodes, profiles, data sources, security settings, and related middleware components.
• Work closely with application teams to understand Java application architecture, runtime requirements, dependencies, and integration points to ensure successful migration and post‑migration stability.
• Perform current‑state assessment – analyze existing application and middleware architecture, document source environment configurations, and identify requirements for replatforming into the target Open Stack‑based environment.
• Migrate middleware configurations – translate and migrate configurations from source to target, ensuring consistency across application server settings, connection pools, JVM parameters, certificates, security configurations, and environment‑specific variables.
• Tune performance and stability – perform application server performance tuning, JVM tuning, monitoring, troubleshooting, and capacity analysis to ensure reliable operation before, during, and after migration.
• Validate application availability – conduct smoke testing, health checks, log reviews, and post‑cutover validation to confirm applications run successfully.
• Coordinate across teams – collaborate with application, infrastructure, database, security, network, and project teams to plan migrations, resolve issues, and communicate technical status.
• Support production cutovers – provide hands‑on support during production migration windows, including after‑hours and weekend work as required.
• Troubleshoot complex issues – act as escalation point for middleware‑related incidents such as deployment failures, application startup issues, connectivity problems, JVM errors, performance degradation, and configuration mismatches.

• 10+ years of enterprise middleware administration supporting large‑scale Java application environments, with strong exposure to data center migration or replatforming initiatives.
• Deep hands‑on experience installing, configuring, administering, troubleshooting, and tuning IBM Web Sphere Application Server.
• Strong experience supporting JBoss application server environments, including deployments, configuration management, performance tuning, and troubleshooting.
• Solid understanding of Java application runtime behavior, JVM configuration, application deployments, logs, connection pools, certificates, and integration dependencies.
• Proven experience migrating applications and middleware platforms between data centers, including current‑state discovery, configuration capture, migration planning, cutover execution, and post‑migration validation.
• Ability to understand current application architecture and support replatforming into an Open Stack‑based target environment.
• Experience migrating middleware configurations from source to target while ensuring application compatibility, security, and operational stability.
• Strong knowledge of JVM tuning, thread pools, heap sizing, garbage collection, connection pool tuning, application server monitoring, and log‑based troubleshooting.
• Ability to work effectively with multiple application teams, infrastructure teams, and stakeholders while providing clear technical updates.
• Willingness to support production cutovers during evenings, nights, and weekends as required.

• Experience with Oracle Web Logic, Apache Tomcat, and Microsoft IIS.
• Experience supporting applications in private cloud or Open Stack‑based environments.
• Experience with shell scripting, Python, Ansible, or other automation tools for middleware configuration, deployment, monitoring, or migration support.
• Familiarity with monitoring tools, incident management processes, change management, release management, and production support procedures.

All information will be kept confidential according to EEO guidelines.