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Last year I worked as contractor for company C for one of their projects. Long story short: It was pure hell.
(The HR company that hired me informed me incorrectly about the job being Java development, X company bought Y company, then X company got rid of most knowledgeable people from Y, hired C for support and such, that was my job. Long tedious hours, unpaid extra hours, incompetent bosses, ridiculous deadlines, no licensed software, etc).
I even had health issues due the lack of sleep/stress/malnutrition (no time to eat properly). I quit after 3 months.
Now I'm looking for another job. However I have doubts listing C in my resume due to my experience. I'm worried when on an interview for a job they see me as unreliable, and I know you're not supposed to talk bad about your previous employer, however I can't say a single good thing from my short time at C.
Do I list C? What do I tell when an interviewer asks opinions/evaluations about my job at C?