Mainframe Engineer

Mainframe Engineer Hybrid Working – Edinburgh Financial Services Lorien's leading banking client is looking for a n experienced Mainframe Engineer, this person will support the test environments to enable delivery of features to mobile/online banking customers. The person will have hands-on experience with Mainframe Technologies – CICS and z/OS System Expertise. This role is based in Edinburgh.

This role will be Via Umbrella. Working in a Hybrid Mode. Key Responsibilities: CICS & z/OS Systems Engineering Expertise – Individual must display deep practical experience with how CICS runs on z/OS, beyond application development.

IBM WebSphere Liberty (CICS Liberty) & Java Runtime Skills - A CICS Liberty Infrastructure Engineer must understand Liberty as a runtime and have experience in configuring the runtime Security, Integration & Modern Ops Practices - CICS Liberty environments are exposed to modern integration patterns and strict security requirements. Demonstratable technical experience required would include: CICS system setup and configuration (regions, JVM servers) Understanding of z/OS components used by CICS Liberty (USS, RACF, TCP/IP, SMF) Capacity planning, performance tuning, and availability (HA/DR) Problem determination using dumps, traces, SMF data, and logs WebSphere Liberty configuration (server.xml, features, shared libraries) JVM tuning for z/OS (heap sizing, GC behaviour) Managing Java workload inside CICS (JVM servers lifecycle, diagnostics) Patching and maintaining Liberty and Java SDK levels RACF and TLS configuration (certificates, keyrings, SAF integration) REST/HTTP exposure and API enablement CI/CD awareness (bundles, pipelines, automated deployment) Operational monitoring and log management IND_PC3