Tech investors are throwing money at Front, a five-year-old startup that aims to change the way teams get work done. The startup makes a shared inbox app that lets teams handle messages from email, texts, Slack, and social media, all in one place. This year, the 28-year-old cofounder and CEO of Front, Mathilde Collin, went on a five-day fundraising sprint to raise a Series B round. She pitched 11 investors, received 10 term sheets, or investment offers, and walked away with $66 million from Sequoia Capital and several others.