He is interested in building principled and practical secure systems that leverage advances in programming language techniques. Deian works on several systems, including COWL, a browser confinement system designed for modern web applications, Hails, a security-centric framework for building web platforms, LIO, a dynamic information flow control system, and ESpectro, a security architecture for Node.js. At Intrinsic, he is putting much of this research into practice by building systems, tools, and languages that will ultimately make it easier for developers to build and deploy web applications with minimal trust.