Stefan began his career in Security in 2003 and has since performed hard-core security testing across hundreds of corporate networks and business-critical applications. With the rise of Agile and DevOps Stefan has been focused on secure application development for web and mobile applications, using his skills as both a developer and security expert to champion continuous security in dev teams. Stefan has done dozens of security workshops and security awareness trainings, and frequently speaks at public events and conferences. Most recently, Stefan co-founded GuardRails.io. A security platform that orchestrates security scanning tools, curates their output and makes actionable results available in pull requests. Stefan started the DevSecOps Singapore Meetup group and was one of the core organizers of DevOpsDays Singapore, DevOpsDays Jakarta, and DevSecCon Asia.