Constantin is the operator of GCC matching rounds on Gitcoin.

https://explorer.gitcoin.co/#/round/10/0x30c381033aa2830ceb0aa372c2e4d28f004b3db9

https://explorer.gitcoin.co/#/round/10/0x6726fe9c89fb04eaef388c11cf55be6aa0a62fb9

Round impact can be measured via participation numbers, social network views and funding payouts.