Hello,
I am a professional Unity developer with 3+ years of experience and completed 15+ projects successfully. I can work on every aspect of game development (gameplay, sfx, vfx, in app purchase, advertising, social integration, backend service integration, multiplayer).
I use Photon to implement multiplayer functionality in Unity. Multiplayer functionality implementation workload depends on the type of projects. You didn't mention which type of projects you have. Without knowing project details it's impossible to tell correct timeline and budget. Let's talk about projects in details. Thanks for your time.
Best regards-
Hasib Ahmed