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
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