Job Description

Mainframe Performance & Capacity Administrator - z/OS | Contract | Office Based

We are seeking an experienced Mainframe Performance & Capacity Administrator to support a large‑scale IBM z/OS enterprise environment. This is a high-impact contract role focused on performance tuning, capacity planning, and cost optimisation across mission‑critical mainframe systems.

You will lead performance and capacity initiatives across complex z/OS, SYSPLEX and PR/SM environments, ensuring optimal utilisation of CPU, memory, DASD and WLM‑managed workloads. This role requires deep expertise in RMF, SMF, MXG, MICS, SAS and TMON, along with strong knowledge of MIPS, MSU, 4HRA and soft capping models.

Key Responsibilities

  • Analyse RMF and SMF records to diagnose performance issues
  • Tune WLM service definitions and optimise workload placement
  • Lead capacity forecasting and modelling across enterprise estates
  • Support SCRT reporting a...

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