Bitbucket requires JIRA as its base. During signup, you'll be prompted to create a Bitbucket account if you don't already have one – or you can use an existing Bitbucket account.
We'll automatically connect your Bitbucket account to JIRA. This lets you auto-sync your Bitbucket repositories with JIRA and link code commits to JIRA issues.
If you're using Bamboo in the cloud, you can configure it to build from source code maintained in your Bitbucket repositories.