Worked on the pulumi/pulumi repository to deliver template versioning support in the Pulumi CLI, enabling users to fetch specific template versions from the registry rather than defaulting to the latest. This was achieved by routing versioned template requests through the GetTemplate API and removing CLI-side version validation, allowing for explicit version selection such as pulumi new private/org/template@1.0.0. Comprehensive tests were added to ensure reliable versioned template resolution while maintaining compatibility with existing workflows. The work focused on backend and API development using Go, improving template management reliability, reproducibility, and supporting precise rollbacks for organizational infrastructure patterns.