I don't even know where to begin. You will be constantly pulled in every direction by flippant demands from the exec team. Then if you don't complete all the external work that has been randomly dumped on your plate plus the work that you already had; you will be seen as "too slow for start up culture" and fired immediately. There are also layoffs quarterly. Also the layoffs are sometimes indiscriminate of performance and completely cost cutting measures. (i.e you can be fired even with positive performance).