I never had any luck with incoming recruiters and often it turns out into huge waste of time. Scheduling/re-scheduling, they don't call on time, there's a delay

I never had any luck with incoming recruiters and often it turns out into huge waste of time. Scheduling/re-scheduling, they don't call on time, there's a delay, there's something else. In the end it looks like they are not really hiring otherwise they'd treat you with more respect.