App is written in pure JS using MTProto protocol. I have spent first week on it :D
There are a lot of things to fix and make, I will mention few of them:
- 2FA (UI is ready, but crypt algo, unfortunately, doesn't work)
- Reply and search don't make view jump to selected message.
- Smarter message loading (I think, I should make linked list for that)
- Log out button (certainly, it should be done, sorry :\)
- "Keep me signed" checkbox at the start (btw, app will keep you signed, auth_key is saved in cookies and localStorage)

Website is also available at: https://telegram.dkaraush.me

The design of the app doesn't fully comply with the mockups provided in the competition. Transferred size: 285KB. Overall speed is below average – the app is a bit sloppy on rendering flags in the selector, also when opening chats. The contest task is almost completed, lacking photo uploading for the signup flow. 2SV is yet to implement.

The following deficiencies were identified during the testing:

– Incorrect sorting of the countries list;
– Missing countries search;
– Missing phone number formatting; 
– 'Next' button appears instantly once the page is loaded;
– Missing action buttons on chat headers;
– Members counter blinks in groups and disappears; 
– Missing profile photos of group members in groups.

Country list is not sorted alphabetically and a quick search is not possible

2fa does not work

Login with password fails

Can't log in after entering the password. Gave exceptions if change the visibility of the password. Password is correct