When it comes to unicorns, payments start-up Stax may be one of the rarest of the rare.⁠ ⁠ It's a billion-dollar start-up run by a minority woman – 34-year-old co-founder and CEO Suneera Madhani, the daughter of two Pakistani immigrants – at a time when just a tiny fraction of venture capital funds go to women founders and people of color.⁠ ⁠ "[I was] a reluctant entrepreneur," Madhani tells CNBC Make It. "I was the last person to bet on me. And I think that's the case for a lot of women."⁠ ⁠ She shares how she beat self-doubt to build a $1 billion start-up at the link in our bio. #EmpowHER