I work with VERY competent black people but I work for a very large and well known company who can go out and find them and if necessary import them.
I sold for IBM and at one time my sales manager was black.
He was excellent and our district lead the region for years, but IBM took no prisoners, if you couldn't cut it you got bounced and color didn't matter.
IBM maybe would give a black person an extra time period to get right but if they couldn't, tough.