The mandate - "hack shoes" in 8 hours. The tool - an API that had the access to the full range of shoes under the HH Brown brand.
What I developed was an Android app called Shoe Gamble. The idea of the app was simple enough - take in some basic information from the user, such as their gender and the minimum and maximum that they were willing to spend on a pair of shoes. The app would generate a random shoe that would give the user the option to buy that pair of shoes at a discounted price. If the user didn't like that particular pair of shoes, they could have another go. However, the percent discount offered this time would be lower. If the user wanted a third go at it, they would need to wait 24 hours.
This mechanic did what many apps struggle to - make customers keep coming back. If the company was inclined to, they could also game the "randomness" of the generated shoe. It would be easy enough to raise the odds of a particular pair of shoes coming up to cut down on excess stock, for example.
My app was chosen as the best one at the event for the idea, and for the complete implementation as a native Android app. Being the sole developer on my team also let me hold onto all the winnings!