We're looking for a mid-level .NET Engineer to join a large-scale .NET 10 upgrade program focused on strengthening a complex API landscape. This role will play a key part in upgrading critical APIs and services, helping to improve platform security, stability, maintainability, and long-term resilience.

This initial 6-month contract will see you working closely with service-owning squads to deliver upgrades across multiple services, resolve compatibility challenges, and establish repeatable upgrade patterns that support a secure, consistent, and supported technology environment.

What you'll do

- Upgrade enterprise APIs and services to .NET 10
- Refactor applications and components to address framework compatibility requirements
- Resolve build, runtime, deployment, and dependency-related issues
- Maintain application stability and minimise regression risks throughout upgrades
- Collaborate with development teams on code reviews, testing, validation, and releases
- Deliver automated testing enhancements to support quality outcomes
- Work within existing CI/CD pipelines to deploy changes through multiple environments
- Establish repeatable upgrade methodologies and technical standards
- Document upgrade approaches, technical decisions, and lessons learned




- Support production releases and post-deployment validation activities

What you'll need

- Solid commercial experience with C# and modern .NET development
- Proven experience upgrading applications between major .NET versions
- Strong ASP.NET Core and API development experience
- Experience with dependency management and package upgrades
- Ability to refactor legacy or incompatible application components
- Strong automated testing experience across unit and integration testing
- Experience working with CI/CD pipelines and controlled deployment processes
- Strong troubleshooting skills across build, runtime, and compatibility issues
- Experience working within large-scale enterprise environments highly regarded

The perks

- Join a significant enterprise-wide technology modernisation program
- Work across a large and complex API ecosystem
- Influence technical standards and repeatable engineering practices
- Gain exposure to platform-wide transformation with immediate business impact

By applying for this role, you consent to Natural Selection Group collecting and using your personal information to assess your application and contact you about this and other relevant opportunities via phone, email or SMS. You can opt out at any time.

#J-18808-Ljbffr

📌 .Net Engineer - mid level (Melbourne)
🏢 Natural Selection Group
📍 Melbourne