I'd say it's a bit of both. You can build yourself up and find such work in companies which have it. Not switching employers very frequently helps, because buil

I'd say it's a bit of both. You can build yourself up and find such work in companies which have it. Not switching employers very frequently helps, because building credibility takes time. After you've built up credibility in some interesting tech, other companies would find you based on your work. This is just my observation, so take it with a grain of salt