Android Lock Screen Music Controls -- 2

I need a developer who can wire proper play / pause as well as previous-next buttons into my existing Android app so that they appear on the lock screen and in the pull-down notification shade (just under the Wi-Fi and other system icons)... (Budget: ₹600 - ₹1500 INR, Jobs: Android, Android App Development, Android SDK, Android Studio, Kotlin, Mobile Development, Visual Basic, Visual Studio)