“What does it take to build a billion-dollar SaaS enterprise-software company?” I hear this question a lot in my work as a tech investor, and it’s incredibly tough to answer. I bet mountain climbers feel the same way when they’re asked how they conquered a major summit. The answer is both incremental -- you succeed by placing one foot in front of the other, of course -- and more pragmatic, in that the journey is always broken into multiple, distinct phases.