Inayaili de León is a Senior Designer at Microsoft Developer Services — where she works on the design system for Azure DevOps. Previously, she led the team creating Canonical’s Vanilla design system. She writes frequently for well-known online publications and on her own blog, and speaks at international conferences. She’s the co-author of “Pro CSS for High Traffic Websites” (Apress, 2011), and author of “Moving to Responsive Web Design” (Apress, 2016). She’s Panamanian Portuguese, born in the USSR, and lives in London.