Looking for app marketing Expert

Hello Freelancers. Looking for an Expert who can handle app promotion works longtime. We are running website and we are looking for reliable workforce or individual who already have experience in following categories. Android and iPhone app ratings/installs (Should not removed from app store Or infringe any of respective store privacy policy. As app should safer side) Social media marketing App submission and many more. Please write descent proposal which i can consider best and affordable for long run. Happy Bidding.