Senior engineer - mainframe

Create your best future and join Westpac as a Senior Engineer - Mainframe.

What's the role?

This role sits within the Customer & Engineering unit, delivering customer servicing, credit assessment, and product originations technology via online and staff‐facing channels. In addition to maintaining group‐critical applications, you will help drive the adoption of AI‐driven, agentic development for COBOL systems —automating coding, testing, documentation, and change delivery while meeting the bank's regulatory and security obligations.

Your key responsibilities include:

• Design, develop, and support COBOL and CAP COBOL applications on z/OS supporting high‐volume, business‐critical workloads.
• Maintain and enhance online IMS and batch applications, ensuring reliability, performance, and operational excellence.
• Develop and support DB2, IMSDB and sequential file‐based data processing solutions.
• Act as a subject matter expert for COBOL and mainframe practices, defining coding standards, patterns, and modernisation guidelines.
• Ensure that agreed standards and processes within Westpac are adhered to ensure fulfilment of regulatory obligations.
• Apply an AI‐first approach to automate coding, testing, data mappings, orchestration, and documentation.

What do I need?

• Strong experience in COBOL development within large‐scale enterprise or banking environments.
• Exposure to or hands‐on experience with CAP COBOL in production systems.
• Proven experience working with IMS DB (data access, schemas, program interfaces).
• Solid understanding of z/OS mainframe environments.
• Proven experience with Endeavor.
• Exposure to Git, Bitbucket.
• Computer Science (or closely related degree) with a major in software engineering or equivalent.

Why join us?

• Special offers on banking products and discounts from top brands, including generous employee‐only mortgage rates!
• Flexible work arrangements to help you achieve a greater work/life balance, and a variety of leave options including Culture, Lifestyle and Wellbeing leave.
• Tailored learning and development opportunities to help your grow your career within the bank.
• Lots of opportunities to 'give back' to the Community by getting involved in our many volunteering initiatives.

Create your future today

To get started, simply click on the APPLY or APPLY NOW button.

We're all about creating a supportive and inclusive community. We welcome everyone – no matter your age, gender, background, or abilities. We also provide additional support to welcome our veterans, Indigenous Australians and neurodiverse community.

If you need any adjustments during the recruitment process, you can find more information and contact details on our FAQs and how to contact us page , under the 'Diversity, sustainability and flexibility' section.