Atlassian do not support the addons you need to do this in full, and it doesn't look like this is on the roadmap to add to Cloud any time soon. So the best you'll be able to do is code for Teamcity so that it can use JIRA's REST interface to read and update JIRA.
The wait is over... Portfolio for Jira Server and Data Center 3.0 is now officially here! Platform releases offer Atlassian an opportunity to shift our strategy, make bold predictions about t...
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