The best and worst places to build a tech career

Getty Images; Tyler Le/BI How far we get in our careers, we tend to believe, depends on us: our intelligence, our temperament, our hustle. But where we work and the support we get there matter immensely too. Does your company promote from within, or does it hire senior people from elsewhere? Does it spend real money on training and mentoring? Is it somewhere you'd want to stay for the long haul? The age-old problem for job seekers is that, from the outside, it's hard to know. Even if you land…