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You can go have a look at the PRs needing review at 2U - External Contributions · GitHub https://github.com/orgs/openedx/projects/19/views/3 - even if it’s on a repository you don’t have write access to, a review is helpful! Your reviews will also build up expertise & track record, which can be used to get access to more repos.
Taking on a project maintenance task: Issues · openedx/public-engineering · GitHub