Zephyr, a fictional company managing its online retail store with Pulumi, explores best practices for enabling multiple developers to collaborate on projects and efficiently use Git branching. Initially managing their infrastructure with a two-stack approach (development and production), the team faces challenges as more developers work concurrently, leading to potential deployment conflicts. To address this, they shift to allowing each developer to create personal Pulumi stacks, enabling them to iterate and deploy independently in a shared cloud environment without disrupting others. This strategy also includes maintaining a feature-branch workflow with frequent merges to a main branch, ensuring a consistent integration environment. As a result, the team can test changes in a near-production setup before full deployment, reducing risks and improving development velocity. This approach highlights the importance of agile practices in managing complex, containerized applications as the Zephyr team continues to refine their use of Pulumi.