Amazon Web Services (AWS) uses and develops tools based on formal verification to reason about the security of AWS itself, as well as the security of systems that customers build on AWS. This talk will focus on how AWS services connect customers to logic-based techniques, as well as how AWS uses formal verification internally to provide higher assurance of its security. Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales; http://creativecommons.org/licenses/by-nc-sa/2.0/uk/