Hello,
As per your description, I understood that you are looking for an experienced Android developers who can help you to customize the telegram open source code in GitHub and add audio and video calling to this app from QuickBox and Telegram.
We built lots of apps which have video/audio calling features, so I sure that we can quickly accomplish your desired goals, within time and your budget as well.
Just take 5 minutes of your time so we can discuss your project details briefly and start working on your project.
We built over 380+ projects, So we are confident enough that we are the best suitable company for this work.
If you required then, we could show you our past work project.
Our price is considerably lower on average, and we are more favorable in your better feedback than profits.
We are providing you approx time and quote. We will provide final time and quote after discussing detail requirement with you.
We can also provide you ideas or can implement your ideas at our best for this project.
Looking forward to your reply.
Thank you,
Tausif Sindhi