Bill Barber saw an ad on Facebook last year for American Diesel Training Centers, a school in Ohio that prepares people for careers as diesel mechanics. It came with an unusual pitch: He would pay for the schooling only if it landed him a job, thanks to a nonprofit called Social Finance.After making sure it wasn’t a scam, he signed up. After going through the immersive five-week program, he got a job with starting pay of $39,000 a year — about $10,000 more than he made before as a cable TV installer.“I figured this was my best opportunity to succeed,” …
