The story behind the code was quite simple. A collegue of mine got a parking ticket. She exclaimed, "I wish there were an easier way to pay for street parking!" So the target user is anyone that parks on the street, and doesn't want to get a ticket.

One of the key features that was really neat is MongoDB's 2D geospacial index. Whenever someone is in a zone, we are able to find them quickly. We're also able to find all of the zones within a 5km radius.

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