Applications for PhD or postdoc positions go through the general call of the Department of Mathematical Sciences.
You can find current job openings at the Department of Mathematics here: https://www.math.ku.dk/english/about/jobs/
The deadline for the next PhD call is November 15, 2023. https://employment.ku.dk/phd/?show=160124
The deadline for the next postdoc call is November 15, 2023. Postdoctoral Positions in Mathematics – University of Copenhagen (ku.dk)
Note that postdoc applicants should apply both through the university portal and via MATH Jobs: https://www.mathjobs.org/jobs/list/22705
Read more about the vacant position here.
You are always welcome to contact Matthias Cristandl at firstname.lastname@example.org for information about upcoming positions.