Worked on the dotnet/sdk repository to improve the correctness and maintainability of platform version inference within the .NET SDK build system. Addressed a bug where EffectiveTargetPlatformVersion was not properly derived from TargetPlatformVersion when undefined, reducing the risk of platform mismatches in multi-targeting scenarios. Refactored the TargetFrameworkInference.targets file to enforce consistent inference logic across build targets, enhancing overall build stability for downstream consumers. Utilized MSBuild and build systems expertise to implement these changes, focusing on robust target platform version handling. The work emphasized code maintainability and correctness, ensuring more predictable and reliable builds for projects relying on the .NET SDK.