Another day, another mega round for a fintech startup. And this one is mega-mega. Brazil-based Nubank, which offers a suite of banking and financial services for Brazilian consumers, announced today that it has raised a $400 million Series F round of venture capital led by Woody Marshall of TCV. The growth-stage fund is best known for its investment in Netflix but has also made fintech a high priority, with over $1.5 billion in investments in the space.