I tried pomodoro for the focus effect, but I keep using it for a different reason. To avoid the "just one more tweak" trap I sometimes fall into. When the timer is up I decide whether the task is done or not. The latter means I commit another complete block to it, otherwise I move on to the next one. This also works great for non tech things like making music. But don't know if this is "officially" part of the methodology

Distraction wise I have eliminated anything long before that. No notifications except the 3 I actually have to react to immediately, phone in "do not disturb" mode and co-workers learnt that it can take several hours for me to respond to slack messages (but once I do, they get a quality response).