When Sarah Friar quit as the CFO of Square, CEO Jack Dorsey wasn't thrilled. But she felt compelled to take the leap. Friar explains why she left, and how her childhood in a conflict-plagued part of Northern Ireland factored into the decision. Plus, if you're building a company now, how should you navigate this tricky economic environment? How should you think about funding, layoffs, and communication? Friar offers her honest advice, and explains how weathering a downturn can help you create an even stronger company.