It's extremely easy to find a job in Chinese cities, generally speaking. There's lots of jobs for jobs sake - most restaurants have far too many staff, and there's lots of security guards everywhere who run away at the first sign of real trouble.

Regarding homelessness, it definitely exists, although differently from the US etc. If you go into a 24hr McDonalds or KFC you'll see lots of homeless people slumped over tables sleeping because nobody there will kick them out. It's also very common to see homeless people congregating in the lower levels of major railway stations at night.