Many get into computers when they are younger and before they realize they are girls, they continue doing it after they come out because they like it and/or it pays well.
my theory is that trans people are drawn to the internet and therefore, by chance, technology, because it's easier to freely choose how to present and find a safe space
My (maybe controversial) theory is that software engineering is a deeply creative and self-expressive field, more closely related to art and literature than to the "hard" sciences. But it has the clear upside that it isn't stigmatized like Art & Literature, so getting into it isn't met with the same amount of scrutiny & criticism, especially for people who present in a masculine way.