From what I've seen 1/20 female engineers isn't something to be ashamed of for a small company. There just aren't that many available, and I suspect many are scooped up by Amazon/Microsoft/etc to pad their numbers, and that's hard to compete with.

Source: I worked at a ~75 person consulting company; we had two female recruiters who tried really hard to get more female engineers. I think we had like 4.