YC has written a good overview of our business on their blog

Our mission is to make money work for everyone. We do that by building a mobile-first bank account for individuals and businesses.

Founded in 2015 by two programmers, we now have 5 million customers in the UK and are expanding into the US. Our product competes directly with high street banks and has strong product market fit, with a 58% weekly active user rate even years after signing up. We're 2000+ staff (~400 of which make up the product/tech team), and backed by YC, Stripe, Mike Moritz, Eric Schmidt and others

Internally, we encourage an open, collaborative, inclusive working environment. We contribute to open source software, and we continually engage with our wonderful community. We're hiring talented, creative problem-solvers to help us build the bank of the future. Join us!