He, Tharwat
I understand your mind. I can implement the secure for your chat app on firebase.
I'm a Fullstack expert have many experience developing HTML5, HTML, CSS, CSS3, Javascript, Jquery, typescript, PHP, Laravel, NodeJS, CodeIgniter, Restful API, Progress website, responsive design, eCommerce, Shopify, eBay, Stripe, Paypal, payment integration for 7 + years.
If you award me, you'll see my remarkable ability.
Please contact me.