I have just passed the 70-483 exam. The next one will be the 70-486. I thought that that would make me an app builder.
Microsoft Certified Solutions Developer: App Builder 2017
But that is (probably) not the case…
Passing 70-486 would give me: “Microsoft® Certified Solutions Associate: Web Applications”
and after that, I am still required to get one of the electives. Because I passed the 70-345 and 70-355 too soon 
So next stop: 70-486!
Good luck!
ps. will the Microsoft Certified Solutions Developer Universal Windows Platform become obsolete after march 2017?