"At SendHub we’ve let go of about half of the people we’ve hired, most of them within a few weeks of their start date. Looking back at everyone we let go much later, we should’ve terminated them during their probation."

Is it just me or is a company's hiring process fubar if they are firing half their hires within 3 weeks (and more thereafter)? I get the need for early stage startups to not let mediocrity seep in, and having a probationary period is great for that, but I'd argue the company is neglecting their end of the bargain if they are apparently so inept at bringing on the right people.