ENTJ. Sometimes crossing over to INTJ, bit it's situational.
Those playing along should note that the real Meyers-Briggs is much much longer (and tedious) than these online versions, and will often come out different. They're also expensive, and usually employers that like using them will pay big bucks to get the rel one, as well as a couple of others that are more accurate about work interactions.
Usually, because of cost, reserved for leadership types. Then they'll come back from their "enlightening retreat" and cheap out on the staff and do these little ones like at this website. Heh.
Generally Meyers-Briggs is getting long in the tooth and some flaws have been found with it, but it's useful as a wake-up call to introverts who don't notice others behave differently. The extroverts already know and are watching you hide in your cubical and think you're anti-social. Hahaha.
My personal situational triggers are large projects. I turn into an extrovert, want quiet, and want you to leave me the hell alone while I'm hyper-focused on the project. Then I'll come up for air and be an extrovert for a while and come ask how your day is going.
Often the only way to get the peace and quiet necessary in cube farms and crappy office layouts is to be a night owl or ridiculously early riser. Especially in operational job roles where someone always thinks their little problem is the most important one facing the operational engineering staff.
These types of things used to be handled by a really simple human device that is all but gone from the modern workplace, a door. Close it, work on something difficult for a while uninterrupted, open it.
We have a number of software defelopers who wear headphones all day because the company is too stupid to give them a closed work area.