For general info about joining the lab see here. From time to time we post specific opportunities and job openings here.
We are currently recruiting for a postdoc (5 yr) in soil and fungal ecology (deadline for application is 26.11.2018). See here: https://matthiasrillig.wordpress.com/2018/11/06/postdoc-5-yr-in-soil-and-fungal-ecology/
If you are searching for available BSc and MSc thesis topics see here.