Say the line manager wants you. Can HR reject your hiring?
I ask because I spoke to managers a few times and usually it was okay. Sometimes, they say they have to get HR approval first before making an offer.
and this is usually where the trouble begins. HR asks for a lot of stuff not related to the job. If I show them a bad testimonial or I have long gaps unemployed etc (which the manager does not mind as I can do the job well)...can they override the line manager's decision to hire me?