From the limited perspective I have, I guess you are looking for a “scale up”, that is, an established startup with steady funding that is profitable, but either too small or not-quite-there for an IPA or an acquisition to happen yet, with about 100 employees. I have worked for such a company and know others with a similar business, and it’s the best from both worlds in my opinion; you get the structure, financial freedom and delegation of a bigger company, and the flat hierarchy and freedom to do whatever the fuck you want from startups. Can recommend!