-The company is growing at an absurd rate so while there is a ton of work to do, the hiring process moves at a snail's pace. Don't wait on new hires to come in to lighten your load. It won't happen as soon as you're expecting.
-There is absolutely NO training/grace period/learning curve for new hires. You are expected to KNOW everything the day you start and not make any mistakes.
-There is no work/life balance between some departments. You're expected to work ten hour days (which is normal). If you leave on time (6 pm), you're looked down upon because you actually have a life outside of your cubicle. Timings on Fridays are 9am-4pm but I don't remember the last time I left at 4pm on a Friday. You'll be staying till 7 pm every night on average (once again, other departments may differ. I am only speaking on behalf of the department I worked in).
-Regarding timings, you can just tell how unhappy and burnt out the employees are because they have to skip family time, time with kids and other social/personal things just to stay back a few hours to get work done, then repeat it everyday, every week. Yes, there will be some weekends you'll have to come in as well.
-You'll get a performance review within a few months of being there and you'll have to listen to management berate you for making mistakes (though you never got any initial mentoring). So, even if you're unhappy in your current department, there's no lateral movement because the performance review will c-block you from moving elsewhere within the company (perhaps a department where you'll actually thrive).
-Someone within our company once was working so hard (multiple and consecutive all nighters) and burnt themselves out so badly that they were out for over a month being sick. The worst part about that event was that management and the executive team actually applauded that sort of behavior. That's terrible culture.
-Management will encourage you to work hard, NOT smart. This is an old school mentality. Working longer hours does NOT equal to more productivity. They will hamper your ability to work around issues in an efficient and smarter way and pound you over the head with advice that you need to work harder.
-Get used to receiving emails in the middle of the night because some people are so overloaded with work and responsibilities that they don't have a choice but to get everything done, despite not having a social or leisure time in their lives. My advice, put your phone on do not disturb overnight.