Principal Software Engineer, Platform & AI Security

Commonwealth Bank; Sydney; On-site; AUD 180,000 - 230,000; Full time

Job summary

Commonwealth Bank is seeking a Principal Software Engineer to set engineering direction across a technology domain, guiding architecture, platform choices and reuse decisions. You will drive consolidation of systems toward shared, scalable capabilities while remaining hands-on enough to turn technical direction into practical outcomes.

You’ll shape patterns for resilience, security, observability and responsible AI in a highly regulated environment, mentoring senior engineers and delivering

Qualifications

• Foundations across algorithms, data structures, concurrency and distributed-system design.
• Experience owning technical outcomes across complete product or platform surfaces.
• Experience designing and operating production services and APIs at scale using Python, Java, Kotlin or Go.
• Strong API, contract and integration-design capability (REST, OpenAPI, API gateways).
• Full-stack capability with React and TypeScript; backend-for-frontend layers.
• A practical approach to frontend engineering; internal systems-facing apps focus.

Responsibilities

• Own the domain’s technical strategy, including architecture direction, platform choices and build-versus-reuse decisions.
• Drive consolidation and decommissioning, reducing duplication while establishing reusable golden paths.
• Scale platforms from MVPs into resilient, enterprise-ready services.
• Set engineering standards across CI/CD, testing, observability, operational readiness and security.
• Provide hands-on technical leadership across the stack, APIs and internal interfaces.
• Define reliable, observable and responsible approaches to AI with appropriate human oversight.
• Embed regulatory, control, security and privacy considerations into engineering decisions.
• Mentor senior engineers and lift engineering capability through influence and hands-on contribution.

Skills

Foundations in algorithms

Distributed-system design

Platform ownership

API design and integration

Full-stack capability (React/Typecript

Frontend/Backend balance

Cloud-native engineering (AWS, K8s, Go

Observability and security-first

AI/agentic systems with human checks

Job description

Commonwealth Bank is seeking a Principal Software Engineer to set engineering direction across a technology domain, guiding architecture, platform choices and reuse decisions. You will drive consolidation of systems toward shared, scalable capabilities while remaining hands-on enough to turn technical direction into practical outcomes.

You’ll shape patterns for resilience, security, observability and responsible AI in a highly regulated environment, mentoring senior engineers and delivering