Start setting boundaries. Start with something small and I think you'll find it's quite addictive. Another thing is to find out who your supervisor is and what

Start setting boundaries. Start with something small and I think you'll find it's quite addictive. Another thing is to find out who your supervisor is and what their priorities are. Sync yours with his/hers. Some tech companies make it hard to do that, but you can always look at your paycheck and see who signs it.