There is no "technique" for LinkedIn job hunting that I know of, other than keeping your profile complete and up to date. Me personally, I'm a specialist with 11 years of experience, mostly in Java programmming and SOA architectures. There is a lot of demand for such specialists in my country, so I get contacted by recruiters quite often.

Regarding the offer that required no interview - turned out hiring manager and me had some mutual friends, so he just reached out to one of them to get an opinion about me.

For the other offer I had an interview, but it was very short - I think my resume speaks for itself, so it was more like loose talk about my previous projects than real evaluation of my technical knowledge.