When I was freelance, I made a small name for myself by creating the very first WebVR framework, before WebVR was even a thing, and then I told someone I could do HoloLens, having never even touched Unity before, but having tons of C# experience. I started doing more opaque VR Unity work after that at a startup. When that startup inevitably tanked, I got a job at a large consulting firm based on my reputation in the local VR community and a referral from a coworker. I was the only one who had any HoloLens experience going in to a project at the new job, and it just continued from there, reinforcing itself.