Senior Full Stack Engineer (.NET / React)

Senior Full Stack Engineer (.NET / React) About the Company Our client is a Sydney-headquartered B2B software company, backed by private equity, whose platform is used by thousands of businesses across Australia and New Zealand. New investment is funding a move from their legacy .NET platform to a cloud-native .NET and React stack.

About the Role You'll report to the Engineering Manager and join a cross-functional squad alongside a Product Manager, Product Designer, QA and fellow engineers. The role sits at the centre of the platform rebuild, moving core product features onto the new stack and helping retire the legacy application without disrupting existing customers.

Benefits

$900 to $1,050 per day inc. Super

Initial 6-month contract with extension prospects

Hybrid working, three days a week in the Sydney office

Hands-on rebuild work on a modern stack rather than legacy maintenance

Duties / Key Responsibilities

Build and ship features end to end, from React and TypeScript front ends through to C# and .NET APIs

Rebuild features from the legacy application on the new cloud platform, refactoring as you go

Work with the Product Manager and Product Designer to improve features as they move across, rather than copying them like for like

Write automated tests and contribute to the CI/CD pipelines that get releases out safely

Review pull requests and pair with other engineers to keep code quality high

Skills and Experience

5+ years of commercial software engineering, with a proven full stack track record

Deep C# and .NET experience building APIs and services, ideally on ASP.NET Core

Strong React and TypeScript experience on production front ends

Experience moving legacy .NET applications onto modern .NET in the cloud

Hands-on Azure experience, or deep AWS experience and a willingness to cross over

Solid SQL Server or similar relational database skills

Comfortable with automated testing, CI/CD and Git-based workflows

Previous contract roles, with B2B SaaS or product company experience highly regarded

Confident using AI coding assistants in day-to-day delivery

Full Australian working rights

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