CEO is rude and act like a dictator, along with him his buddies who are long time employees.
They will shut you down during meetings, in slack messages and even in all hands. Every meeting is a stress for engineers, Specially for new engineers that involve name calling, long arguments and critical about your ideas.
If you float some new ideas, all long term employees will come together to stop you. They don't like to change.
In couple of years, they will force you out of the company and keep all long term employees.