If you do a pretty targeted job search, there's a decent number of these kinds of jobs on oDesk (full disclosure, I work at oDesk).
Machine learning: https://www.odesk.com/jobs?nbs=1#filter/?qs=machine-learning...
Hadoop: https://www.odesk.com/jobs?nbs=1#filter/?qs=hadoop&st=0
Data Science (as you'll see, not everyone knows what this term means): https://www.odesk.com/jobs?nbs=1#filter/?qs=data-science&...
Algorithms https://www.odesk.com/jobs?nbs=1#filter/?qs=algorithms&s...