The first thing you notice when you enter Sherman Austin’s Long Beach, California, apartment is the sounds. His cellphone buzzes constantly, mostly notifications requiring his attention from StopICE.net, a crowdsourced nationwide alert system he developed to let users know when federal immigration officers are nearby. Then there are the beeps. Follow them and they’ll lead you to Austin’s cramped bedroom, where two large computer screens sit inches from his bed. On one, columns of characters scroll continuously, Matrix-style, tracking traffic and potential attacks on a server he uses for StopICE. The beeps come from the other, which displays security camera feeds outside his apartment. Every time a camera spots a potential intruder, it issues a series of loud beeps. It beeps a lot.