Richard Caunt developed .NET 10 support for application stack configurations in the hashicorp/terraform-provider-azurerm repository, enabling users to specify dotnet_version 10 for both Linux and Windows App Service resources. He updated the provider schema to recognize the new version and implemented validation logic to ensure correct configuration. Using Go for backend development and comprehensive testing, Richard added targeted tests to verify the new functionality and maintain cross-platform consistency. His work addressed the need for compatibility with the latest .NET runtimes, facilitating smoother upgrades for customers and demonstrating careful attention to schema evolution and collaborative development practices within the team.