Senior Engineer (Java API)

Sydney, NSW, Australia

Job Description

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 across Java APIs and Python services—automating coding, testing, documentation, and change delivery while meeting the bank’s regulatory and security obligations.

Key responsibilities

• Design and implement RESTful APIs in Java (Spring), using clean architecture and robust design patterns.
• Build Python services and developer tooling for AI‐assisted and agentic workflows (code/test/doc generation, CI/CD integration).
• Design, build, and operate IDMC pipelines (Cloud Data Integration & Application Integration) for customer master, data integration, and event‐driven interfaces.
• Engineer for non‐functional excellence across reliability, security, performance, observability, and operability.
• Collaborate effectively with engineers and stakeholders in complex project environments.
• Adhere to Westpac standards and processes to meet regulatory obligations.
• Apply an AI‐first approach to automate coding, testing, data mappings, orchestration, and documentation; orchestrate multi‐agent workflows with guardrails, policy checks, and evaluation metrics (e.g., code quality, test coverage, traceability).

What do I need?

• Strong results in programming and application design.
• Deep experience in designing, developing, and implementing RESTful APIs.
• Expert-level proficiency in Java.
• Proficiency with Git and Bitbucket.
• Experience with Spring and Jersey frameworks.
• Experience with AI agentic development.
• Experience with Python, Informatica, Siebel or Cobol is highly desirable.
• Computer Science (or closely related degree) with a major in software engineering or equivalent.

Why join us?

We’re obsessed with becoming our customers' #1 banking partner for life and we’re looking for people who are passionate about helping us achieve that goal. In return, we’re committed to making Westpac the best place to work in the country. Here are just a few of the ways we’re already doing that:

• 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.

#LI - Hybrid.

Job Info

• Job Identification 69342

• Job Category Technology Engineering

• Posting Date 05/27/2026, 11:56 PM

• Apply Before 06/10/2026, 11:56 PM

• Job Schedule Full time

• Locations

  Sydney, NSW, Australia

• Brand Westpac Group

• Program Name Not applicable