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 setting.
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
Strong 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
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📌 .Net Engineer - Mid Level (Melbourne)
🏢 Natural Selection Group
📍 Melbourne