But they happen *way* the crap earlier than with people trying to get jobs. You want to fix things? Fix things at like the elementary school level. People living in poverty will have kids that will also be living in poverty. Kids living in poverty are not nearly so likely to a. value getting a good education, or b. be able to get a good education even if they do value it. People who don't get a good education are less likely to get good jobs. People who don't value a good education are less likely to even *want* to aspire to have a good job, or even know where to look.
So, there are totally still racial inequalities... but it isn't really fair to blame Silicon Valley companies, who I can't imagine for the most part would really care what color your skin is, as long as you're the best at whatever job they're hiring for, and can at least like speak English more fluently than not.