I am a postdoctoral researcher of computer science at CISPA Helmholtz Center for Information Security, working in the research group of Andreas Zeller. My research focuses on languages, techniques, and tools for increasing confidence in software correctness. To this end, I work on testing and program proving approaches and design specification languages for the unit and system level. As part of my research, I contributed Abstract Execution, an automatic verification framework mainly for unit-level program transformations, and ISLa, a language and solver for complex string constraints for the precise testing and analysis of software systems.