Well, as everywhere in the world, it varies. Plus a lot of people have left/are leaving Romania, but even so, for a rather poor country of now around 18 million people (used to be ~23 million in 1990), I think there are around 100k software developers). Which is not too shabby considering where we started (I guess in 1990 we had maybe 5k).
Cluj is growing but it's still a bit of secondary center. Bucharest on the other hand has offices from almost every major player, I think only Facebook, Apple and Netflix are the only ones missing for now (that might change, as things are moving super fast these days). Otherwise, Microsoft, Amazon, Oracle, Google, Intel, Huawei, Adobe, SAP, etc. are there.