Callsign is a software company that provides an AI-driven authentication platform designed to provide secure and adaptive authentication services. The company was founded in 2012 by Ian Welch and Zia Hayat. Callsign is headquartered in Palo Alto, California.

Callsign’s platform uses multi-factor authentication to secure access to services uniquely ensuring frictionless and transparent user experience. The company’s proprietary technology mimics the way humans identify each other in the physical world, creating a unique digital identity for each user.

Today Callsign is deployed to hundreds of thousands of users globally. Its clients are enterprises, financial institutions and consumer-facing digital services and include some of the world’s largest banks, such as Lloyds Bank and Deutsche Bank.