Invision wrote a great blog post about design at Yesware.  Eileen Ani, our Lead Product designer has done a ton over the past 3-4 years to drive design as a priority and differentiator here at Yesware

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We got to the point where we needed a shakeup to allow us to do things outside of the sprint schedule so we could tackle bigger projects instead of just making small, incremental changes all the time