You can find this one in San Mateo, South of the San Mateo text on the map.
Pretty simple, but a lot of fun. Head to the marked ATMs, hack in then decide whether each of the people on the other side get a free bonus, or get financially punished for being terrible. Doesn’t matter what choice you make so go with what you like. There are a few in a row with the same gimmick. Hack them all to complete.