Java Developer – CICS Liberty / Mainframe Integration

Project description

We are looking for an experienced Java Developer with strong IBM Mainframe and CICS Liberty JVM Server experience to join our technology team. You will be responsible for designing, developing, maintaining, and supporting Java applications deployed on CICS Liberty JVM Server within an enterprise mainframe environment. This role requires a strong background in Java development, RESTful API and microservices design, and integration with core mainframe technologies such as COBOL, CICS programs, DB2, MQ, and related z/OS components. You should be comfortable working in a complex enterprise environment, collaborating with cross-functional teams, and supporting both new development and production stability.

Responsibilities

• Design, develop, enhance, and maintain Java applications deployed on CICS Liberty JVM Server Develop RESTful APIs and microservices running on IBM CICS Transaction Server Integrate Java applications with existing mainframe components, including: COBOL programs CICS transactions and programs DB2 databases IBM MQ Other z/OS and mainframe services Develop, expose, and consume REST/JSON and SOAP-based web services. Configure, maintain, and administer: CICS Liberty profiles JVM servers Java application deployments within CICS environments Support application deployment and runtime configuration in z/OS-based environments Optimize application performance, including: JVM tuning memory usage transaction performance application response times resource utilization on z/OS Perform debugging, troubleshooting, and root cause analysis for development, test, and production issues Support incident resolution and provide technical input for production stability and continuous improvement Collaborate closely with: Business Analysts Solution Architects QA / Testing teams Infrastructure teams Mainframe support teams DevOps / Release teams Participate actively in Agile ceremonies, including sprint planning, daily stand-ups, refinement sessions, reviews, and retrospectives Contribute to code reviews, technical design discussions, and quality improvement initiatives Support and participate in CI/CD implementation for Java applications in the mainframe/CICS environment Produce and maintain clear technical documentation, including design documents, deployment guides, support documentation, and operational procedures Ensure all development activities follow enterprise standards, coding guidelines, security policies, and change management processes

SKILLS

Must have

• Proven hands-on experience in Java application development within enterprise environments, at least 8 years. Strong experience with CICS Liberty JVM Server. Practical experience developing applications on or integrating with IBM CICS Transaction Server. Experience developing RESTful APIs, microservices, and web services. Strong understanding of REST/JSON and SOAP service development and consumption. Experience configuring or supporting CICS Liberty profiles, JVM servers, and application deployments. Good understanding of z/OS runtime environments and mainframe application architecture. Experience with performance tuning, memory management, and JVM optimization. Strong debugging, troubleshooting, and root cause analysis skills. Ability to analyze complex technical issues across Java, CICS, DB2, MQ, and mainframe components. Experience working within Agile delivery teams. Strong communication and collaboration skills, with the ability to work effectively with both technical and business stakeholders. Ability to produce high-quality technical documentation and follow enterprise development standards. Experience integrating Java applications with mainframe technologies such as: COBOL CICS programs DB2 IBM MQ

Nice to have

N/A