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— Building Felix, the Design System for GrouponSeveral new features have been released on Groupon.com recently, such as the QR code in the navigation bar to download the app, and a banner carousel to display multiple banner messages within a single view.In the past, similar product features might take 2–3 sprints to complete, but now all of these features are developed and tested in a single sprint. The reason why we can finish the development and testing efficiently is mainly credited to Felix,...