Staff Software Engineer - Backend & Cloud

About the role

CommSec Technology's Product & Investing Crew is hiring a Staff Software Engineer to design and build the backend services and cloud infrastructure that process high-volume, high-integrity financial transactions for one of Australia's largest online brokerage platforms. The role sits in the crew that owns the platforms behind order lifecycle, equities trade processing, clearing and settlement, complex products and portfolio value management. It is weighted toward backend, systems and cloud engineering, with front-end exposure a bonus.

Key responsibilities

• Design and build resilient APIs and event-driven systems in C#/.NET on AWS
• Influence architectural decisions across distributed, transaction-critical systems
• Take end-to-end ownership across the SDLC, from design and development through deployment, observability and production support
• Contribute to solution design and architecture for systems handling high-volume financial transactions
• Partner with product owners and domain leads to turn complex trading and settlement requirements into technical solutions
• Mentor engineers and contribute to technical standards and continuous improvement

Required profile

• Deep backend engineering experience in C#/.NET and REST API design, with a grasp of distributed systems, transactional integrity and event-driven architecture
• Experience designing and building scalable, secure services on AWS, including cloud-native patterns, containers and infrastructure-as-code
• Comfortable applying CI/CD, automated testing, observability and performance optimisation
• Uses AI-assisted engineering tools such as GitHub Copilot and Claude Code
• Nice to have: some front-end exposure (React/TypeScript)

Required skills

• C#.NET, microservices, REST APIs
• AWS, cloud-native applications, infrastructure as code
• SQL, query optimisation, message queues (e.g. SQS/SNS)
• CI/CD, Docker, Kubernetes, observability, automated testing
• Event-driven systems, workflow orchestration