Information technology is transforming how almost every market works: finance has been transformed by algorithmic trading and bitcoin, ridesharing is changing the nature of public transportation, Amazon is revolutionizing logistics, and Airbnb is now the most valuable accommodation provider in the world. This transformation, which has been led by start-ups and newly dominant technology companies, inherently combines technical and economic aspects, as entrepreneurs take advantage of the potential of technology to facilitate exchanges that were previously infeasible. This crash course in the key tools from economics and computer science that are being used to design digital markets exposes students to a range of concrete and topical practical problems in the area.