Is it peer to peer exchange or exchange like bitfinex/kraken? Are these positions for compensation like salary or equity? Or combination?

depends on how many unique users per day you have

Your price engine looks cook. Where I can find examples?

it is also not working on some phones. Why is that?

Do you have 2FA? I think it is crucial for such app.

What amount of traffic you have? It would help to make marketing decisions.

Should be a setting. Some people do not want their numbers to get exposed for sure.

Basically you run full node for every currency like bitcoin core for bitcoin. Full node download entire blockchain and keep you up to date with transactions, they also allow you to do all sort of operation like get new address, send money and etc using json-rpc api. You can read more about full node api here https://bitcoin.org/en/developer-reference#bitcoin-core-apis

Are these limits for unverified accounts? What are the limits if you verify your account?

What platform/framework your website? Wordpress?

You probably want to move it to source control system like github. It will track you changes and other people can fork it.

I looked into buying BTC for US and got zero offers. Also, I didn't find a way to see all offers for United states. How I do that?

What platform/framework/language your market place use?

What it has to do with bitcoin?

Google Forms > Survery Monkey. Completed your survey anyway.

Great work! Added to bookmarks!

Add me as beta tester. I am interested!

I like Telegram bots and it is cool idea, but mains issues are private keys and escrow. How are you planning to handle that?

It is incredibly hard, unless you have some outstanding feature. There are plenty of web wallets. Figure out what is your advantage over them.

Such a cool idea! Looking forward for the launch!