CEO has little sense of any system outside of the one he has constructed. He has built a very complicated custom system for managing work that is cumbersome and becomes half your job. Expects you to fall into line with company nomenclature and practices immediately but provides no onboarding at all beyond giving you passwords to things. I didn't even know what role they actually wanted me to fill for weeks. CEO would hijack terminology from the development world to describe unrelated things and proceeds to put you down for not understanding what he's saying in front of clients, no less. Puts the responsibility on you for features failing while pushing to have things changed in an already out of sync production build.
You better know vtiger inside and out before you start because you need to know all it's features and capabilities and be able to navigate though dozens of custom builds. Not to mention vtiger has exactly zero documentation and no one will give you the broad overview of how the system works. You'll need to read the code, but there is no time for that.
I have never been at a company that puts so much effort and caring into the professional development of it's people but is so dismissive of it's new hires. It's an enigma.