A 23-year-old Google employee lives in a truck in the company's parking lot and saves 90% of his income

When 23-year-old Brandon S. headed from Massachusetts to the Bay Area in mid-May to start work, he opted out of settling into an overpriced San Francisco apartment.

Instead, he moved into a 128-square-foot truck.

The idea started to formulate while Brandon - who asked to withhold his last name and photo to maintain his privacy on campus - was interning at Google last summer and living in the cheapest corporate housing offered: two bedrooms and four people for about $65 a night (roughly $2,000 a month), he explains to Business Insider.

"I realized I was paying an exorbitant amount of money for the apartment I was staying in - and I was almost never home," he says. "It's really hard to justify throwing that kind of money away. You're essentially burning it - you're not putting equity in anything and you're not building it up for a future - and that was really hard for me to reconcile."