[melonbar]

This. I currently was given a lot of responsibility in a short amount of time (I am a software lead developing isomorphic SPAs) despite the fact that I am far from a senior dev. Sometimes companies just need people to step up. It could be a boon or a disaster but the best you can do is make the situation clear to management and just keep doing your best. Sounds kind of cheesy but honestly this could be an answer to all of those questions. Sometimes you just have to do the best you can, focus on the task at hand, and if that is not enough then que sera sera.