No real on-call rotation - senior techs are always on-call.
Very few documented procedures.
You will receive next to no training.
Unprofessional Management - Expect to be spoken to with profanity and aggressive language, as well as to be reprimanded (yelled at) in front of your peers.
No specialization - technicians are expected to know everything and do everything regardless of skill level, and senior technicians are expected to take low level support calls while working on complex projects.
High turnover rate.
Toxic, Stressful environment - You will be constantly under pressure to meet deadlines on important projects, all while taking support calls and resolving service outages. Other technicians will be unwilling or unable to assist you.