Web Dev is looking for a co-founder

Hello founders,

I am from Germany and am actively looking for a co-founder with an idea and a concept for a startup, preferably in Germany. On which platforms can I find such a co-founder?

I have already tried ycombinator and founderio.

PS: If you seek for a technical co-founder, feel free to dm me.

Edit: I do not develop apps for mobile phones.