When you apply for a job, it’s a bit like calling someone after the first date. You really want them to call back to make plans. You keep looking at your phone (or hitting “get mail” in your mailbox) while you pretend to be doing something else.
What if you don’t hear back? How should you go about following up?
I like the “3 Touch” rule. Reach out three times to follow up. It can be emails, voice mails, LinkedIn messages or a combination of all three. 
Your messages (on either platform) should be short and meaningful. Include your name and the role that you applied for. If someone important suggested that you apply, mention that next. Make a reference to the most relevant thing you bring to the table. It could be your current title, the software you developed, the award you just won, Anything that might offer a spark of recognition when your resume hits the top of the pile.
If after three tries, you hear nothing, walk away. You have made a strong impression. You don’t want to cross the line into “oh no, not her again”.
Keep in mind, you might still in the running for the job. All sorts of things happen behind the scenes to delay a positive response.
Your resume might be the next one to review when the recruiter gets called into two back to back meetings and that rolls into lunch and then all of the sudden, it’s the end of the day. The resume pile goes home for an evening work session, but then he or she falls asleep on the couch only to be woken at 3am by the dog.
Or the hiring manager decides that this role is not as important as the other two in the department and so the focus shifts away for a week or two.
Be diligent and move on. There are lots of opportunities out there. Keep raising your hand and someone will call on you.
Recruiter's Couch 