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 doUpgrade enterprise APIs and services to .
NET 10Refactor applications and components to address framework compatibility requirementsResolve build, runtime, deployment, and dependency-related issuesMaintain application stability and minimise regression risks throughout upgradesCollaborate with development teams on code reviews, testing, validation, and releasesDeliver automated testing enhancements to support quality outcomesWork within existing CI/CD pipelines to deploy changes through multiple environmentsEstablish repeatable upgrade methodologies and technical standardsDocument upgrade approaches, technical decisions,



and lessons learnedSupport production releases and post-deployment validation activitiesWhat you'll needStrong commercial experience with C# and modern .
NET developmentProven experience upgrading applications between major .
NET versionsStrong ASP.NET Core and API development experienceExperience with dependency management and package upgradesAbility to refactor legacy or incompatible application componentsStrong automated testing experience across unit and integration testingExperience working with CI/CD pipelines and controlled deployment processesStrong troubleshooting skills across build, runtime, and compatibility issuesExperience working within large-scale enterprise environments highly regardedThe perksJoin a significant enterprise-wide technology modernisation programWork across a large and complex API ecosystemInfluence technical standards and repeatable engineering practicesGain exposure to platform-wide transformation with immediate business impactBy 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.
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📌 .Net Engineer - Mid Level (Melbourne)
🏢 Natural Selection Group
📍 Melbourne