Mainframe Middleware Infrastructure Engineer

Salary: £36,000 - 60,000 per year

Requirements

• Deep knowledge of CICS systems engineering and z/OS infrastructure
• Experience with CICS region setup, configuration, and JVM server management
• Strong knowledge of IBM WebSphere Liberty administration and runtime configuration
• Experience managing Java workloads, including JVM tuning and performance optimisation
• Working knowledge of RACF, TLS, certificates, keyrings, and security integration
• Experience with REST/API enablement and modern integration practices
• Ability to perform problem determination using dumps, traces, logs, and SMF data
• Experience with capacity planning, resilience, HA/DR, and operational support
• Experience with CI/CD pipelines, automated deployments, and release processes
• Knowledge of monitoring, observability, and middleware operational management

Responsibilities

• Support the engineering, configuration, optimisation, and support of modern Java workloads running within CICS Liberty environments
• Manage CICS region setup, configuration, and JVM server operations
• Administer IBM WebSphere Liberty runtime environments
• Tune JVM performance and manage Java workloads
• Implement and support REST/API enablement and modern integration practices
• Investigate and resolve issues using dumps, traces, logs, and SMF data
• Support capacity planning, resilience, HA/DR, and operational stability
• Work with CI/CD pipelines, automated deployments, and release processes
• Contribute to monitoring, observability, and middleware operational management

Technologies

• API
• CI/CD
• IBM
• IBM WebSphere
• Support
• JVM
• Java
• REST
• Security
• Websphere
• DevOps

More

We are offering a 6-12 month contract for a Mainframe Middleware Infrastructure Engineer (CICS Liberty) based in London or Edinburgh with a hybrid working model of 2-3 days onsite. This is an excellent opportunity to work on critical banking and financial services infrastructure while helping modernise core mainframe platforms with contemporary Java and API technologies. We are seeking someone to join a major enterprise transformation programme and help support our modernisation efforts.