Poll: What software development methodology does your startup use?

My general feeling is that software development methodologies are used by large companies to manage their software development processes. While startups, in order to remain lean, do not burdened themselves with the overhead of methodologies. In order to find out how much of this is true I would like to ask HNer's: what development methodology does your startup use?

Even if you do not completely follow a methodology, select the option that is closest to what you use. If your methodology is not a poll option, comment on what you use, the size of your team, how long you've used the methodology and how successful it has been for you.