Mainframe Performance and Capacity Analyst – Banking

Salt Digital Recruitment; Greater London; Remote; GBP 60,000 - 80,000; Full time

Job summary

A global consultancy is seeking a Mainframe Performance and Capacity Analyst to optimize performance for a major banking client. This fully remote role focuses on performance diagnostics and capacity planning within critical z/OS environments, requiring extensive experience and knowledge in performance management.

Qualifications

• 7+ years’ experience in mainframe performance tuning and capacity planning.
• Knowledge of SMF, RMF, WLM and performance management tooling.
• Comfortable in high-availability banking environments.

Responsibilities

• Monitor, analyse, and tune mainframe system performance.
• Conduct capacity forecasting and support infrastructure provisioning.
• Develop and maintain custom tooling and dashboards.

Skills

Mainframe performance tuning

Capacity planning

SMF

RMF

WLM

High-availability environments

Performance management tooling

Tools

APA

MXG

SAS

ELK stack

Job description

Contract Role: Mainframe Performance and Capacity Analyst – Banking – Inside IR35

Location: UK (Remote) or Denmark (Hybrid – 10 days/month onsite)

Rate: £475-£575/day (Inside IR35, via umbrella)

Duration: 6 months+

Start: ASAP

Client: Global Consultancy, End Client in the Banking Sector

Salt is working with a global consultancy delivering high-level mainframe optimisation services to a major banking client. We are recruiting an experienced Mainframe Performance and Capacity Analyst to support proactive tuning and capacity planning across critical z/OS environments.

This role sits within a Performance Competence Centre, with responsibility for system and application performance diagnostics, workload forecasting, and tooling optimisation.

Key Responsibilities:

• Monitor, analyse, and tune mainframe system and application performance
• Conduct capacity forecasting and support infrastructure provisioning
• Lead performance data analysis and reporting using SMF, RMF, WLM
• Develop and maintain custom tooling and dashboards
• Liaise with technical teams to prevent capacity-related issues
• Create documentation, reports, and performance improvement plans

Essential Skills:

• 7+ years’ experience in mainframe performance tuning and capacity planning
• Strong knowledge of SMF, RMF, WLM, and performance management tooling (APA, MXG, SAS)
• Ability to analyse batch and online application performance
• Comfortable working in high-availability banking environments

Desirable Skills:

• Experience with ELK stack or in-house dashboarding tools
• Coding experience in REXX, Python, Assembler, or PL/1
• Familiarity with z/OS system internals and workload behaviours

Working Model & Compliance:

• UK-based contractors: Fully remote. Must work via umbrella (inside IR35)
• Denmark-based contractors: Hybrid model, 10 days/month onsite
• Background checks to be completed post-onboarding

*Rates depend on experience and client requirements

Job Information

Job Reference: JO-2506-354316

Salary: £450 - £575 per day + Inside IR35

Salary per: day

Job Duration: 6-12 months

Job Start Date: 28/07/2025

Job Industries: Telecoms

Job Locations: Greater London

Job Types: Contract

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