From a few impressions in Berlin, I'd say it's possible and also not that unusual. At a startup I worked in the past, a now-friend of mine came in as a freelan

From a few impressions in Berlin, I'd say it's possible and also not that unusual. At a startup I worked in the past, a now-friend of mine came in as a freelance-PM for a few months and also helped setting up the PM process. The time he was there probably the most productive period at that startup feature-wise. If that is also something you can provide I would say that there are a lot of potential startups out there which just raised a Series A which could be interested. At a digital agency I freelanced for I think about half the PMs were parttime PMs (some freelance, some employed). From what I've gathered from friends the situation at a lot of digital agencies is similar. Not sure how they got to that position though.