Dear colleagues, I am advertising a PhD position in categorical methods in computer science at Tallinn University of Technology, jointly supervised by Paweł Sobociński<https://www.compose.ee/pawel/> and me (Mario Román<https://www.marioroman.xyz/>). The duration of the PhD programme is 4 years, with a gross monthly salary of 2300€. The deadline for applications is on the 12th of July 2026. Applications can be submitted via the following link. - https://taltech.teamdash.com/p/job/RFey8aBC/early-stage-researcher-phd-posit... The Compositional Systems and Methods group<https://compose.ee/> at Tallinn University of Technology is a lively, welcoming and diverse group working on different topics across theoretical computer science and sharing a common interest in categorical methods. We work closely with the Logic and Semantics group<https://cs.ioc.ee/lsg/> in the same University. Tallinn University of Technology, and our group in particular, remains committed to equality, diversity and inclusion; we particularly encourage members of discriminated minorities to apply. Please do not hesitate to contact us for any questions or more information. Best regards, Mario