No matter how you like to participate in developer communities, Pulumi wants to meet you there. If you want to meet other Pulumi users to share use-cases and best practices, contribute code or documentation, see us at an event, or just tell a story about something cool you did with Pulumi, you are part of our community.

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Yes you can. I do this all the time in CI. I'm using a self managed backend but i imagine it's the same for cloud

Confirmed, stacks have independent state. If you see an issue with this, please file a bug report.

The Pulumi Service ensures only one deployment (up, down, refresh) runs concurrently on the stack level.