Mainframe Engineer – z/OS CICS

Engineering
Midlothian
April 27, 2026
Permanent
Urgent

Job Description

Lorien’s leading banking client is looking for an experienced Mainframe Engineer who will support the test environments to enable delivery of features to mobile/online banking customers. The candidate must 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 – deep practical experience with how CICS runs on z/OS, beyond application development.
  • IBM WebSphere Liberty (CICS Liberty) & Java Runtime Skills – experience configuring and managing Liberty as a runtime.
  • Security, Integration & Modern Ops Practices – ensuring CICS Liberty environments meet modern integration patterns and strict security requirements.
  • Demonstrable technical experience includes:
  • 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)
  • Managing Java workload inside CICS (JVM server 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

Location

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