It depends on all the functionality you need. Not everything in JIRA is exposed via REST APIs and hence you might need a plugin in some cases.
I would recommend taking a look at existing products like ConnectAll (developed by my company) and see if that works for you. I know that it works between Cloud and on-Premise instances.
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Trello is one of the most effective tools for driving your sprints. It's customizable for every Agile team and product owners and Scrum masters (SM) love it. However, Agile teams often struggle with:...
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