Adding user accounts to any site can be a daunting but very important initiative. I was tasked with the design and UX for adding user accounts to CarRentals.com. Working closely with product and engineering, I created the user accounts experience from scratch. Being a responsive site, I worked with a mobile-first approach and created all the designs for mobile before starting on the desktop experience. I found this worked very well and made scaling the designs to desktop a breeze. Things like cancelling a rental car reservation and viewing trip details became quick and easy, and helped eliminate unnecessary calls to customer service.