Senior Software Engineer- C#, .Net

Senior Software Engineer (C#, .Net)

Business Banking Technology | Sydney or Melbourne

• You are a deeply hands-on engineer who loves solving complex problems.
• We are high-performing engineers rebuilding Small Business Banking from the ground up.
• Together we're building tomorrow's business bank today.

Do work that matters

We built Australia's number one banking app - and then rebuilt it.

Now, we're transforming the Small Business Banking experience within NetBank. We're creating a modern, personalised digital platform designed specifically for business customers - distinct from retail and corporate banking.

This is a rare opportunity to shape a critical rebuild at scale, used by millions of customers.

See yourself in our team

As a Senior Software Engineer, you'll join a squad delivering the new Small Business Banking experience. You will play a key role in supporting architecture, raising engineering standards and hands-on engineering.

You will spend the majority of your time designing and building production systems, while influencing technical direction across the crew.

You will:

• Design and develop scalable microservices and APIs
• Define and influence architecture for enterprise-scale applications
• Improve engineering standards, quality and secure coding practices
• Guide integration with internal and third-party services
• Contribute to safe deployments through CI/CD, automation and observability
• Drive pragmatic, high-quality engineering decisions

We're looking for engineers who

• Are genuinely hands-on and comfortable owning complex systems end-to-end
• Have strong backend engineering capability (REST APIs, microservices)
• Have designed or contributed to enterprise-scale architecture
• Understand security, reliability and performance at scale
• Thrive in collaborative environments and challenge ideas constructively
• Care deeply about code quality, simplicity and long-term maintainability

Technical capability

We use a broad range of technologies. You don't need all of them - but strong engineering fundamentals are essential.

Our ecosystem includes:

Backend

• C# .NET Core, REST APIs, WebAPI
• Microservices and API integration

Frontend

• Next.js, React, Angular, TypeScript

Cloud & DevOps

• AWS or Azure
• Kubernetes, Docker
• CI/CD (GitHub Actions, TeamCity, Octopus, Azure DevOps)
• Infrastructure as Code (CloudFormation)
• Logging & observability (Splunk, monitoring tools)

Data

• MSSQL, Oracle, Snowflake
• NoSQL / DocumentDB

Experience with event-driven architecture (Kafka) is beneficial.

If you're a senior engineer who loves being deep in the code- we'd love to hear from you.

Apply now.

We support our people with the flexibility to balance where work is done with at least half your time each month connecting in the office.

If you're already part of the Commonwealth Bank Group (including Bankwest, x15ventures), 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.

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