Hi,
I started freelancing a few years ago. I'm a front-end developer.
I hadn't changed my legal name then yet.
So, I did what every trans programmer should do. Not disclose the fact, as long as I can.
I remember my first customer very well.
I told him after I was contracted that my name wasn't the name that was going to show up on the invoices.
He freaked out... because he thought I was outsourcing the job.
The "ohhhh okay" of relief he exhaled when I said I'm trans is something I will not forget.
No company that I know has cared about me being trans, nor it has impacted anything, which is, in my opinion, how it should be. I do not need to disclose my transness anymore (neither I freelance), but I know it wouldn't be an issue.
I only remember transphobia from my family.
Just in case, I'm spanish, maybe your mileage will vary elsewhere.
Hope this is informative!