If I understood the top-level post correctly, no. They are very much not working for a FAANG, nor for a talent agency that works for a FAANG. They're working

If I understood the top-level post correctly, no. They are very much not working for a FAANG, nor for a talent agency that works for a FAANG. They're working for a company that supplies software tools to high-frequency traders or something similar. Very, very different. (Of course, the original question was "not FAANG or HFT", so this still may not be what they were looking for...)