That is unfortunate, because these are special skills you may but find inhouse. I know some guys that did it inhouse for a long time, toured from project to project in the right phase and saved bigcorp lots of money. Now they are doing it publicly.
Usually large companies attract or develop these skills by their scale. I do think there a lot of smaller companies that are underserved in this area, though.
https://efficientware.net/how-we-work/