>Get in contact with current employees at the company. It is important that you send more than one email. I've gotten dozens of emails asking for meetings and referrals. The only time I actually respond to these is after the second email.
Please, no. Go through the proper channels like everyone else. If you have a referral - great. Otherwise, DON'T spam current employees you randomly find on linkedin or whatever. I get those from time to time and ignore 100% of them.
Some people don't though, and their referrals are much more valuable than dozens of additional applications.
Much like many other decisions you're making in the job market, it's a polarizing choice that increases your overall chances when the alienated class of people isn't too large. If 90% of people ignore those emails but your chance of getting a first-round interview goes up 5x compared to a cold application when the remaining 10% respond, 2+ emails are easier to send than 1 application, especially when you've done the legwork to make your application any good.
I haven't used techniques like these specifically yet, but as somebody who nearly always eventually gets the job once I've had a first-round interview, I wouldn't be opposed to seeking out the hiring manager and contacting them directly to decrease the resumé false rejection rate.