Commonwealth Bank
Senior Software Engineer- C#, .Net
2 Locations · Posted 28 May 2026
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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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