Championing accessibility improvements, so that people using screen readers or keyboard only users could also donate to St. Jude (and to be 508 compliant). See accessibility improvement examples.
Completely redesigning the post-donation experience so that donors are properly thanked and appreciated for their gift, correlated with donor retention increases.
Updating the layout and other visual elements of the form to more closely adhere to the brand, including showing an image of a patient; A/B testing showed a 3.17% lift in conversion rate at 99% confidence and a $4.08 increase in revenue per visitor.
Changing credit card entry fields to decrease the time on task by 9 seconds and conversion rate by 3.75%.