Here's a link to an article by the Guardian: https://www.theguardian.com/lifeandstyle/2017/aug/08/why-are.... It was published in 2017. The third paragraph points out that 20% of Google engineers are women, and they further go on to claim that statistic is roughly matched among big tech companies. I work for a large employer (30K+ employees), and 4 of the 5 software developer managers I interact with on a daily basis are women. I work on a team of 8 developers. We have one female developer. Two of our sibling teams of about the same size have three female developers between them.