The University of Helsinki invites applications for a Postdoctoral Researcher in Theoretical Evolutionary Biology to model the evolution of sex-specific differences in immunity and life-history traits. The position focuses on developing mathematical and computational models using approaches such as life-history theory, optimal control, adaptive dynamics, and population genetics. The postdoc will join the interdisciplinary consortium Sex Differences in Immunity, collaborating across evolutionary biology, immunology, genomics, demography, and statistics. The fully funded position is for three years and offers strong support for international collaboration and conference participation.