Funny thing with experience. It might be harder today, but I once started a Wordpress engineer job with zero Wordpress exprience, which I was quite open about. The company said they wanted hardened, very very good PHP engineers and that your average Wordpress developer usually wasn't that good.

We ended up building the biggest WordPress sites in the world, by volume of traffic served. By the end of it WordPress wasn't WordPress anymore with all of the plugins we built that basically replaced whole sections of it.