Staff Software Engineer Sydney or Melbourne location See Yourself in Our Team While the Payment Domain is part of the Business Banking unit, its reach extends to every part of the Bank. You will be joining the Real Time Payments Execution Engine team, which is responsible for overseeing the suite of applications used for payment execution. At present, these applications are commercial off-the-shelf solutions provided by a vendor. However, the future roadmap includes building similar applications internally to better align with our strategic goals. Do work that matters We are creating the bank of tomorrow today and require top Engineers who focus on the customer experience and deliver exceptional solutions. Our Payments team is leading a transformative program to enhance customer experiences, driving innovation and exploring modern technologies in payment solutions. As a Staff Software Engineer, you'll own the end-to-end development lifecycle of payments platforms products based on highly mature DevSecOps standards, ensuring seamless integration and delivery across environments. As such, your responsibilities may include, but not limited to; Hands-on development and architecture of high-performance Spring Boot microservices in Java, capable of processing thousands of payment transactions per second with sub-second response times. Building fault-tolerant and self-healing payment systems using advanced Java concurrency patterns, reactive programming, and distributed system resilience techniques. Developing comprehensive automated testing suites including unit tests, integration tests, contract tests, and performance tests for payment microservices. Implementing event-driven payment architectures using Java-based message processing and streaming solutions for real-time transaction handling. Code reviewing, mentoring development teams, and establishing Java coding standards and best practices for payment system development. Designing, developing, and managing platform solutions that span on-prem and multi-cloud (AWS) environments. Leading CI/CD pipeline development and optimization. Automating operational tasks using scripting languages (e.g., Python, Bash). Integrating observability tools to enhance system visibility and reliability. Managing the full DevOps lifecycle, from build to release, with a focus on security, scalability, and performance. Your Experience Proven experience in full cycle software development & delivery roles within cloud environments. Expert-level Java development skills (Java 11) with extensive hands-on experience building enterprise-grade applications and deep understanding of JVM internals, garbage collection tuning, and performance optimization. Advanced Spring Boot and Spring ecosystem expertise for reactive programming, Spring Cloud for distributed systems, Spring Security for authentication/authorization, and Spring Data for database abstraction. Proven track record in designing and implementing microservices architectures from scratch, including service decomposition, API design, data consistency patterns, and inter-service communication strategies. Deep expertise in Java concurrency and multithreading, parallel streams, thread pools, lock-free programming, and reactive programming with Project Reactor. Advanced knowledge of design patterns and clean architecture principles with ability to write maintainable, testable, and scalable Java code. Hands-on experience with resilience libraries like Resilience4j, implementing circuit breakers, rate limiters, retry mechanisms, and bulkhead patterns in Java applications. Strong proficiency in Java testing frameworks including JUnit 5, Mockito, TestContainers, WireMock, and property-based testing for comprehensive test coverage. Proven experience leveraging AI-powered development tools (Roo-Code, Claude Code, Cline, Windsurf, Cody, Lumin AI) to accelerate code generation and refactoring workflows. Strong hands-on expertise in AWS, CI/CD tooling, and scripting for automation. A deep understanding of observability practices and tools. Solid experience in end-to-end testing, including test automation and quality assurance practices. Technical Skills : Java, Advance Spring Boot Microservices, AWS: EKS, Helm, Cloud Formation, CI/CD If this sounds like you, apply today! We support our people with the flexibility to balance where work is done with at least half your time each month connecting in office Whether you're passionate about customer service, driven by data, or called by creativity, a career here is for you. Our people bring their diverse backgrounds and unique perspectives to build a respectful, inclusive and flexible workplace. We are working hard to build a team of people who represent the rich diversity of our customers and communities. If you're excited about this opportunity but you don't meet every single requirement, or your experience doesn't align perfectly, we still want to encourage you to apply. You may just be the perfect candidate for this opportunity or another within CommBank. At CommBank we will inspire you with work that makes a difference, surround you with talented people that respect and value each other, and empower you to grow professionally and personally. Most of all, making a positive impact for customers, communities and each other is part of our every day. We're determined to make a real difference for Australia's first peoples. We encourage all interested applicants to apply. If you're already part of the Commonwealth Bank Group (including Bankwest), you'll need to apply through Sidekick to submit a valid application. We're keen to support you with the next step in your career.