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Start by reading our developer guide.
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Review open issues and submit a pull request.
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Issues. Before working on an issue make sure to claim it. To do so, leave a comment on the GitHub issue thread like "I'm working on this issue and would like to claim it." Conversely, if someone else is working on an issue then try looking for a different issue to work on instead.
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Code and commit style. The Zulip project maintains high standards for clear communication in our code and our Git commits. See the Zulip guide to clear and coherent commits, and the Zulip Mobile style guide.