Infoplus Technologies UK Limited
Mainframe Middleware Infra Engineer – CICS Liberty
London
Posted 1 day ago
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Role/Job title - Mainframe Middleware Infra Engineer – CICS Liberty
Work Location - London and Edinburgh
Role type - Contract Inside IR35
Mode of working – Hybrid / 2-3 days
Duration of assignment - 6 months
Your Profile
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.
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Essential skills/knowledge/experience:
- 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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Skills
CICS System Setup
z/OS Components
Capacity Planning
Performance Tuning
Problem Determination
WebSphere Liberty Configuration
JVM Tuning
Java Workload Management
Patching
RACF Configuration
REST/HTTP Exposure
CI/CD Awareness
Operational Monitoring
Log Management
Location