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
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