Seems so many of us have been hired at one of these companies. Same here. No source control. No bug tracker. No tests. There was no formal system for producing builds--releases to customers were simply copied from the workstation of whichever engineer could build it successfully today. There were so many bugs and crashes, it was hard to even get through basic customer use cases. There was no spec. There was no product roadmap or plan. Sales would sell something, then run downstairs and say "We just sold XYZ, you need to implement XYZ in the software blob somewhere!"

The CEO/Founder wouldn't even consider a refactoring or cleanup session, let alone a full or partial rewrite. Only features drive sales, and we've sold so many things we don't have, so all he wanted was feature cram. Every so often, a VIP customer complained about some major use case that simply didn't work, so only in those cases was bug fixing permitted. And in those cases, the VIP customer would get a custom bespoke build made with the bug fixed. I was hired because the last person of my seniority could not cram features in fast enough and gave up in disgust.

They only got source control because I came in on a weekend, unpaid, to do it. I lasted a little over a year. Bootstrapped founder (and sole shareholder) eventually sold the company for ~$150M. Sometimes it seems there is no justice in the world :)