Full job description£Open Rate GBP

Hybrid WORKING

Location: Central London, Greater London - United Kingdom Type: Contract

We’re looking for a highly experienced Mainframe Performance & Scalability SME to support a short-term consulting assignment, helping assess the resilience, scalability and future performance of a critical enterprise platform.

You’ll lead a structured technical investigation into an established IBM mainframe environment, using evidence-based analysis to identify performance constraints, optimisation opportunities and future scalability risks.

This is not a traditional BAU support role - you’ll be working as a trusted technical advisor, collaborating with senior architects and engineering teams to deliver meaningful recommendations that influence future technology decisions.

Key Responsibilities *Lead technical investigations into mainframe performance, scalability and capacity challenges.
*Analyse Db2 and CICS workloads to identify bottlenecks, inefficiencies and optimisation opportunities.
*Review database growth, SQL performance, access paths, indexing strategies and data management approaches.
*Assess mainframe capacity, workload management, batch processing and MSU utilisation.
*Investigate performance impacts from infrastructure changes, including IBM Z migrations and cryptographic processing.
*Correlate business transactions with application, database, CPU and I/O behaviour to identify root causes.
*Review monitoring and observability capabilities across the platform.
*Assess performance testing approaches and validate scalability assumptions.
*Produce clear findings and prioritised recommendations for senior technical stakeholders.
About You

You’ll have extensive experience across: *IBM Z mainframe environments and performance optimisation.
*Db2 for z/OS performance analysis, including SQL tuning, access paths, RUNSTATS, REORG, locking and workload behaviour.
*CICS transaction processing and application performance analysis.
*Mainframe capacity management, including RMF, SMF, WLM and MSU utilisation.
*Batch and online workload analysis, identifying performance constraints and scalability risks.
*Mainframe monitoring and diagnostics tooling such as OMEGAMON, MainView, BMC AMI, RMF/SMF or equivalent.
*Performance testing, workload modelling and capacity assurance.
Consulting Skills

Alongside deep technical expertise, you’ll be comfortable with: *Leading technical discussions with architects, engineers and senior stakeholders.
*Challenging assumptions and validating findings through evidence.
*Turning complex technical analysis into clear, actionable recommendations.
*Working independently within a consulting environment.
*Communicating effectively with both technical and non-technical audiences.
If you’re interested in discussing this further, feel free to reach out.