The location is called UNIT.city, it is still there and running events. The 2022 edition of Dev Challenge didn't happen there though, it happened in Poland ins

The location is called UNIT.city, it is still there and running events. The 2022 edition of Dev Challenge didn't happen there though, it happened in Poland instead, but the organization is still located in Kiev. And yes, maybe some of the programmers are fighting in a war, directly or indirectly, with guns or with computers.