Hello Everyone! I'd like to introduce my Contest Watcher telegram-bot.

It works both with Codeforces and AtCoder! This bot will make your Competetive Programming life better.

Functional:

1. Notifications settings. With my bot, you can customize your notifications the way you wouldn't miss any contest ever. (You can choose from 1 minute to 24 hours)
2. Getting an upcoming list. Typing one command is definitely faster than checking out 2 websites.
3. Getting rating changes. You can add you, your friends, and anyone whose rating you're interested in. You'll get a message with rating changes as soon as they're out.
4. Group chats. You can add bot to any group chat, this way everyone will be able to add either his handle on Codeforces or username on AtCoder. You'll get a collective rating changes list, notifications, and more.

I've been enjoying developing this bot, hope you'd like using it. You can check source code here. If you have any feedback I'll be more than happy to read it.