I need a notification system with my freelancer-like website, including but not limited to:
1. Message notification for users, including sound.
2. Email notification for e.g. new message, new seller application, gig approval etc.
Please provide me with the specific solution (e.g. 3rd party / library / build from scrach etc.) that you would use for this project before we move on to discuss further. I need the real expert who can get it done with efficiency and quality