Mainframe Consultant

Consult; Greater London; Hybrid; GBP 110,000 - 150,000; Full time

Job summary

Consult in London is seeking 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 consultancy-led assignment focuses on performance investigation, capacity planning and scalability assurance rather than BAU support.

The role requires proven mainframe performance expertise, hands-on Db2 for z/OS and CICS proficiency, and experience with RMF/SMF data.

Qualifications

• 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.
• Consultative mindset with the ability to challenge assumptions, structure investigations and present clear findings to senior technical audiences.

Responsibilities

• 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.

Skills

Mainframe performance

Workshop facilitation

Consultative mindset

Tools

Db2 for z/OS

CICS performance

RMF/SMF data

WLM policies

OMEGAMON

MainView/BMC AMI

Dynatrace

Datadog

Job description

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.