Mainframe Performance & Scalability Consultant
Inside IR35 | London Hybrid
We're looking for a highly experienced Mainframe Performance & Scalability SME to lead a strategic assessment of a large-scale IBM mainframe environment supporting critical financial services operations. This is a consultancy-led assignment focused on performance investigation, capacity planning and scalability assurance, rather than BAU support or traditional systems programming work.
What you'll be doing
- Conducting deep-dive analysis of mainframe performance, scalability and capacity constraints across a complex IBM z/OS estate.
- Investigating Db2 and CICS workloads to identify bottlenecks, inefficiencies and long-term scalability risks.
- Reviewing database growth, workload management, batch processing and infrastructure utilisation.
- Assessing the impact of platform migrations, TLS processing and CPU/MSU consumption using production evidence.
- Leading technical workshops with architects, platform teams and senior stakeholders, providing evidence-based recommendations for future growth.
We're looking for
- Proven expertise in mainframe performance and scalability assessments within large enterprise environments.
- Strong hands-on knowledge of Db2 for z/OS , including SQL optimisation, access paths, buffer pools, locking and database growth strategies.
- Deep understanding of CICS transaction performance , workload behaviour and application-to-database interactions.
- Experience analysing RMF/SMF data , WLM policies, capacity management and workload attribution.
- Familiarity with performance tooling such as OMEGAMON, MainView/BMC AMI, RMF/SMF, Dynatrace or Datadog .
- A consultative mindset with the ability to challenge assumptions, structure investigations and present clear findings to senior technical audiences.
Mainframe Consultant in London employer: Consult
At Consult, we pride ourselves on being an exceptional employer that fosters a dynamic and inclusive work culture. Our North America team is dedicated to professional growth, offering robust training and development opportunities while working in a fast-paced, innovative environment. Join us to be part of a collaborative team that values your contributions and supports your career aspirations in the exciting MedTech sector.
