Principal Software Engineer

You are collaborative and enjoy solving analytical problems to help our team to reach highest potential.

• We are a team of big thinkers who are engineering the future of banking

• Together we will build tomorrow’s bank today, using world-leading technology and innovation

Do work that matters

We're building tomorrow’s bank today, which means we need creative and diverse engineers to help us redefine what customers expect from a bank. Envisioning new technologies that are still waiting to be invented and reimagining products that support our customers and help build Australia’s future economy.

Within Retail Technology, you’ll be part of our Consumer Cards Transformation (CCT) Crew under Consumer Finance Domain. The CCT Crew has end-to-end responsibility for the Commonwealth Bank Cards Modernisation, moving everything legacy to the cloud-based platforms including the core Cards Platform.

See yourself in our team

The CBA technology unit delivers the best digital banking services to Commonwealth Bank customers and to do so is responsible for digital delivery, group data and analytics, technology, and technology infrastructure, cyber, fraud, physical security, and business resilience for all divisions across CBA. It is also dedicated to delivering the best workplace technology experience for our over 53,000 people across CBA and focused on providing the latest tools, technology, and resources to enhance the way we work together and empower our people to achieve more for our customers.

We are seeking an exceptional Principal Engineer to join our team and lead our efforts in designing and implementing highly resilient, scalable, and integrated systems. This individual contributor role will have a significant impact on shaping our technology implementation and roadmap, focusing on creating robust, high-performance solutions that can handle massive traffic and ensure seamless customer experiences.

You’ll be at the forefront of our technical strategy, working across teams to architect and design highly available and resilient systems. Your expertise will be crucial in evolving our infrastructure, optimizing our integration patterns, and ensuring our services can scale to meet the demands of millions of users.

We’re interested in hearing from people who:

• Have demonstrated experience in architecting and designing highly available, resilient, and scalable APIs and customer-facing systems

• Can lead the development of integration patterns and strategies across our technology stack

• Drives the adoption and implementation of best practices for cloud-native architectures on AWS and Azure

• Collaborates with cross-functional teams to identify and resolve complex technical challenges

• Contributes to the technology roadmap, influencing strategic decisions on system design and infrastructure

• Mentors and guides other engineers, fostering a culture of technical excellence and innovation

• Conducts system design reviews and provide expert consultation on critical projects

• Develop and implement strategies for monitoring, alerting, and rapid incident response

• Continuously evaluate and recommend new technologies and approaches to enhance system resilience.

Tech Skills

We use a broad range of tools, languages, and frameworks. We don’t expect you to know them all but experience or exposure with some of these will set you up for success in this team:

• Very strong proficiency in C# (.NET ecosystem), Python, REST APIs, asynchronous patterns, and testing frameworks

• Proven track record of architecting and delivering large-scale, mission-critical system

• Exceptional understanding of integration patterns and microservices architectures

• Deep expertise in designing and implementing highly available and high-traffic APIs

• Risk mindset: proactively manage security, privacy, resiliency and change risk; evidence-based decision making

• Cloud & Platform: AWS (Fargate, S3, EMR/Redshift optional), containerisation (preferably Docker), infrastructure-as-code

• CI/CD & DevSecOps: GitHub Actions, ArgoCD; supply-chain security, automated quality gates

• Observability & Reliability: Splunk, Grafana, Prometheus, PagerDuty; performance engineering and chaos testing

• GenAI: Agent Frameworks (Langgraph, Pydantic etc), MCP (for tools), AWS bedrock and familiarity with AI Evaluation

• Any experience with the following would be great - Containerization technologies (high preference on Docker containers), Infrastructure-as-code tools, Event-driven architectures and message queuing systems, Performance tuning and optimization of large-scale systems.

Working with us

Whether you’re passionate about customer service, driven by software engineering, or called by creativity, a career with us is for you.

We support our people with the flexibility to balance where work is done with at least half their time each month connecting in office. We also have many other flexible working options available including changing start and finish times, part-time arrangements and job share to name a few.