Senior Systems Engineer (Mainframe Storage)

Commonwealth Bank of Australia; Sydney; On-site; AUD 120,000 - 180,000; Full time

Job summary

Commonwealth Bank of Australia in Sydney is seeking a seasoned Mainframe Platform Engineer to help engineer, maintain and improve IBM Z infrastructure, z/OS systems and storage platforms that underpin critical banking services.

You will work across the mainframe technology landscape, building capability across hardware, storage, operating systems, connectivity, performance, resilience and automation, while focusing on availability and security.

Qualifications

• Solid experience in mainframe infrastructure engineering, systems programming or storage engineering.
• Ability to learn across the IBM Z ecosystem and work across multiple areas.
• Knowledge of IBM Z/infrastructure technologies (z/OS, JES2, TSO/E, ISPF, JCL) is a plus.
• Strong troubleshooting, risk assessment and collaborative skills.

Responsibilities

• Engineer and enhance enterprise IBM Z, z/OS and mainframe storage infrastructure with a focus on availability, resilience, security and performance.
• Support hardware installations, upgrades, capacity changes, storage migrations and technology refreshes.
• Engineer storage infrastructure including DASD, storage subsystems, logical volumes, FICON and SAN connectivity.
• Analyse storage utilisation, I/O performance, channel activity and system capacity to identify and address performance constraints.
• Diagnose complex hardware, storage, operating system and performance issues and drive root-cause analysis and permanent remediation.
• Support storage replication, disaster recovery and infrastructure resilience capabilities and participate in recovery testing.
• Develop automation and tooling that improves provisioning, monitoring, maintenance and operational processes.
• Explore responsible uses of AI-assisted engineering for troubleshooting, automation, documentation, knowledge discovery and analysis.

Skills

Mainframe infra

Systems programming

Storage engineering

Automation

AI-assisted engineering

Job description

Do Work That Matters

Join our Mainframe Platform Engineering team and help engineer, maintain and continuously improve the IBM Z infrastructure, z/OS systems and storage platforms that underpin critical banking services.

This is an opportunity to work across the mainframe technology landscape rather than being confined to one specialisation. You'll bring established expertise in one or more areas while continuing to build capability across hardware, storage, operating systems, connectivity, performance, resilience and automation.

See yourself in our team

You’ll join a technology environment where complex, business-critical systems demand rigorous engineering, collaboration and continuous learning. The role offers the opportunity to deepen your existing expertise while developing capability across adjacent mainframe technologies.

In this role, you will:

• Engineer and enhance enterprise IBM Z, z/OS and mainframe storage infrastructure with a focus on availability, resilience, security and performance.
• Support hardware installations, upgrades, capacity changes, storage migrations and technology refreshes.
• Engineer storage infrastructure including DASD, storage subsystems, logical volumes, FICON and SAN connectivity.
• Analyse storage utilisation, I/O performance, channel activity and system capacity to identify and address performance constraints.
• Diagnose complex hardware, storage, operating system and performance issues and drive root-cause analysis and permanent remediation.
• Support storage replication, disaster recovery and infrastructure resilience capabilities and participate in recovery testing.
• Develop automation and tooling that improves provisioning, monitoring, maintenance and operational processes.
• Explore responsible uses of AI-assisted engineering for troubleshooting, automation, documentation, knowledge discovery and analysis.

We're interested in hearing from people who:

Bring solid experience in mainframe infrastructure engineering, systems programming, storage engineering or a closely related discipline. You don't need to be a specialist in every part of the IBM Z ecosystem. Of equal importance is strong engineering judgement, curiosity and the ability to learn unfamiliar technologies and solve problems across traditional technical boundaries.

Experience across several of the following will set you up for success: IBM Z infrastructure and z/OS, with knowledge of technologies such as JES2, TSO/E, ISPF and JCL. Enterprise mainframe storage, including DASD configuration, provisioning, capacity management and performance optimisation. IIBM DS8000 and TS7 storage technology, FICON/SAN connectivity or mainframe I/O architecture. Storage replication, disaster recovery and resilience technologies such as GDPS, HyperSwap, Metro Mirror or Global Mirror. Monitoring, diagnostics and performance analysis using technologies such as RMF, SMF, OMEGAMON or comparable tooling. Automation or scripting using REXX, Ansible, Python or related technologies. Delivering complex infrastructure changes safely in large-scale, business-critical environments. Strong troubleshooting, technical risk assessment, collaboration and knowledge-sharing capability.

Exposure to Parallel Sysplex, Coupling Facilities, System Automation, NetView, CICS, Db2, IMS, IBM MQ, Endevor or broader IBM Z hardware and software is advantageous, but deep expertise across every technology is not expected.

The advertising framework specifically recommends focusing on transferable capability and potential, distinguishing essential from desirable experience and avoiding overly long requirement lists, so I've consolidated the original technology catalogue accordingly.

Learning and development

You’ll have the opportunity to deepen your established specialisation while intentionally developing expertise in adjacent areas, whether that means moving from storage into z/OS and hardware, strengthening automation capability, or exploring emerging AI-assisted engineering practices.

The focus is on combining strong systems engineering expertise with new tools and approaches that can help engineers investigate problems, automate effectively, improve documentation and make complex platform knowledge more accessible.

Working with us

At CommBank, we’re committed to creating an accessible, inclusive and respectful workplace.

If you require support or adjustments, please let us know.

We welcome applications from people of all backgrounds and we’re particularly committed to making a positive difference for Aboriginal and/or Torres Strait Islander Peoples.

For support please contact 1800 989 696.

If you’re already p