Tesla

It is a great experience. Young people get a lot of responsibility. You get full ownership of your zone of responsibility. It is truly gratifying to see the fruits of your labor. There is also admittedly some "cool" factor that helps to motivate you. You need to be the type to grind through a lot of BS for what I expect to be a limited period of time. You come out the other side very strong, though.

Constantly changing needs from management.

They like to pull their parachutes at the very last second, when they could have benefited so much from doing so earlier. That leads to perpetual uncertainty and stress.

Some illogical decisions from above. Middle management can be a revolving door.

It can be frustrating if you feel like you are being run around in circles needlessly.

Treat employees like a limited, valuable resource. The environment led to employees feeling like they were cannon fodder. I truly loved the fast pace. I loved being scrappy, but when I felt like I was being sent in the wrong direction for a dumb purpose, it was counter-motivating.

Be careful what you ask your engineers for. Just spend 5 minutes planning before you pull the trigger.