The technology doesn't actually work all that well.
Tech is highly rigid and difficult to manage, update, or improve due to the nature of the systems. As a result, you will have trouble making an impact, and the turnover of engineers at the company is quite severe.
Management is not setting you up for success, they will throw you into the deep end and expect you to fly.
The Management Clique hires their friends and lovers directly into management. Promotions from within are non-existent. Raises are non-existent.
Spineless management will not be honest with you regarding your output, progress, standing, and compensation.