Data from NHS England showed the unit at Leeds General Infirmary had similar death rates to two other centres but said the hospital came "very close" to an alert threshold.

BBC: Leeds heart surgery: MP calls for committee inquiry

Other projects included a dashboard that predicts when petitions will cross the 100, 000 signature threshold, documentation and step-by-step primers on using the API, email alert systems that inform you when a petition on an issue you care about has been created, and more.

WHITEHOUSE: Looking Back at the White House Hackathon