Same way only easier; since your skill is more specific making it easier for people to figure out what to hire you for and for you to find out who your clients

Same way only easier; since your skill is more specific making it easier for people to figure out what to hire you for and for you to find out who your clients are. I guess your portfolio could relate some use cases. And lacking those there are a zillion open data projects that could probably use your help which you could use to build your name. Also a good way to network a bit as probably people with big data know other people with big data who are hiring.