Principal Software Engineer - Full Stack (React, Next.js, Node.js, .NET)

About the role

The Commonwealth Bank is hiring a Principal Software Engineer - Full Stack to join its Customer Service Network team in Assisted Technology, in Sydney. The team is reimagining how branch colleagues support customers, building capabilities such as intelligent concierge, agentic appointment booking, customer-intent capture, skills matching and smarter branch operations. The role brings deep full-stack expertise across TypeScript, React, Next.js, Node.js, APIs.NET and cloud to define architecture and build modern services at scale, with AI and agentic capabilities central to the engineering strategy.

Required profile

• Deep systems thinking and end-to-end architecture experience across interconnected environments
• Full-stack engineering breadth, ideally TypeScript, React, Next.js and Node.js, with ability to support legacy technologies where needed
• Experience delivering cloud-native, distributed systems (APIs, event-driven architectures, SDKs, CI/CD, IaC, observability)
• Ability to turn ambiguous business problems into technical options and architecture, influencing multiple engineering teams
• Experience leading large-scale modernisation of legacy environments
• Strong integration engineering, especially authentication, identity, biometrics, NFC or hardware-to-software
• Practical use of AI-powered and agentic tools across the software lifecycle
• Secure-by-design, resilient, observable engineering from discovery through deployment
• Principal-level leadership, mentoring Staff, Senior and Software Engineers

Required skills

• Node.js, Express.NET Core C#, microservices, Web APIs
• React, Next.js, TypeScript
• Apache Kafka, event streaming
• Oracle PL/SQL, MongoDB, AWS NoSQL services
• AWS, AWS CDK, Terraform, AWS CloudFormation
• GitHub Actions, CI/CD pipelines, GitHub, monorepo architecture
• Unit, integration and E2E testing, Specmatic API contract testing
• Observe, Prometheus, Grafana, PagerDuty

Candidates already part of the Commonwealth Bank Group must apply through the bank's internal application process.