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Department of Software Science

  • An old conjecture by Henk Barendregt, Herman Geuvers and Jan Willem Klop, stating that every weakly beta-normalizing type system is also strongly beta-normalizing, has been solved. The solution was part of the October 6 release by OpenAI of a torrent of 719 papers detailing solutions to at least 372 other long-standing open problems in mathematics and theoretical computer science.
  • Our former PhD students Jules Jacobs is the winner (jointly with Jan Martens) of the IPA Dissertation Award for 2024, and another former PhD student, Thom Badings, has won the IPA Dissertation Award for 2025. Congratulations to Jules, Jan and Thom!!!
  • The ICFP 2016 paper Higher-Order Ghost State, authored by Ralf Jung, Robbert Krebbers (SWS), Derek Dreyer, and Lars Birkedal, received the 2026 ACM SIGPLAN Most Influential ICFP Paper Award
  • More news..
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Software shapes every aspect of our modern lives. The cost and quality of software crucially relies on the availability of powerful tools. These tools need to provide programmers with abstractions that elevate their productivity, that simplify code maintenance, that ensure code correctness, and that lead to dependable and sustainable software. All these aspects pose major scientific challenges and, at the same time, constitute an enterprise with huge societal relevance. Our mission is to conduct world-leading research on software systems, covering formal methods, compilation/code-generation technology, empirical analysis, and tool construction. We aim to bridge the gap between theory and applications, and seek impact through publications, tools, applications, and people.

We have expertise covering a broad range of topics concerning analysis of computer-based systems, mathematical foundations, and software construction, increasingly involving the use of AI. We collaborate with stakeholders from industry and other application areas, trying to understand how our research can contribute to solving real-world problems. Our group is partner of ESI, participates in the Dutch Institute for Programming research and Algorithmics (IPA), the Dutch National Education Lab AI (NOLAI) and the European Lab for Learning and Intelligent Systems (ELLIS), and supports the Dutch National Association for Software Engineering (VERSEN). TOP Software Technology is a spin-off company founded by members of our group.