First job I left to go back to college, but quite honestly I had checked out of that place and hated the team I was on. Was a pretty large networking company, spent all my time writing RFPs and vendor specs, zero time writing software.

Next one was a cheap tech startup that worked by recruiting people for peanuts, including hiring cab drivers doing night courses in IT, and placing them in telcos looking for business analysts for multiples of what they were actually getting paid. Hated the cheapness, left after a few months.

Then it was a FAANG company, which looked after it's people really well, but the frickin politics really grind you down, left there after a few years after my team got shuffled around on a whim from some exec.

Last role was a utility company, and it was a total mess internally. Vested interests, complete underfunding of the data processing systems, and major consulting firms scamming them for millions a year to produce meaningless reports. Impossible to make an impact, or even bring things up to code... For example, there was zero version control on software, zero! Things were tested on production. I stayed there far too long, should have left the first day, like a few hires actually did.