Mainframe Developer

Mainframe Developer

Posted 2 weeks ago by Webologix Ltd/ INC

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Negotiable
Undetermined
Undetermined
London Area, United Kingdom
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Application Development Application Programming Interface (API) Customer Information Control System (CICS) IBM Software Java (Programming Language) Java Virtual Machine (JVM) Mobile Application Development Performance Tuning Resource Access Control Facility Shared Libraries Software Development Systems Engineering TCP/IP z/OS

Summary: The Mainframe Developer role requires expertise in CICS and z/OS systems engineering, focusing on the practical aspects of CICS operations beyond application development. The position demands proficiency in IBM WebSphere Liberty and Java runtime, along with a strong understanding of modern integration and security practices. Candidates must possess skills in system setup, performance tuning, and operational monitoring within CICS Liberty environments.

Key Responsibilities:

  • CICS & z/OS Systems Engineering Expertise
  • IBM WebSphere Liberty & Java Runtime Skills
  • Security, Integration & Modern Ops Practices
  • 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

Key Skills:

  • CICS system setup and configuration
  • Understanding of z/OS components used by CICS Liberty
  • Capacity planning and performance tuning
  • Problem determination using dumps and logs
  • WebSphere Liberty configuration
  • JVM tuning for z/OS
  • Managing Java workload inside CICS
  • Patching and maintaining Liberty and Java SDK levels
  • RACF and TLS configuration
  • REST/HTTP exposure and API enablement
  • CI/CD awareness
  • Operational monitoring and log management

Salary (Rate): undetermined

City: London Area

Country: United Kingdom

Working Arrangements: undetermined

IR35 Status: undetermined

Seniority Level: undetermined

Industry: Other

Detailed Description From Employer:

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.

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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