After a contest, if you want to discuss a question with a friend you can do pair-programming together. You can also run code in 5 of the specified languages(C++, java, javascript, python and GO)
DEMO: https://caucus-app.herokuapp.com/
CODE(client): https://github.com/Rishabh-malhotraa/caucus
CODE(server) — https://github.com/Rishabh-malhotraa/caucus-server
PS: If you liked the project please consider star-ing the repo on GitHub, cheers!
UPDATE: Thank you soo much for such a positive response, we are all already 70+ stars on GitHub all thanks to codeforces fam, I'm looking on to adding an option to load codeforces & atcoder problem directly to the website, currently, it only supports leetcode questions. CHEERS!