Yes it does. By default, any Phoenix application works this way just as any other app. One of the biggest perks to the BEAM VM is how well it handles managing

Yes it does. By default, any Phoenix application works this way just as any other app. One of the biggest perks to the BEAM VM is how well it handles managing state though. Most other languages aren't designed to do this well, so stateless web apps focus on just passing information from the client to somewhere else that holds the state (database, redis, etc). Nothing is really stateless, it's just a question of where you decide to hold the state.