It does depend what you do, and how you do it, but the results suggest that your scale needs to go a lot higher; typical London contract rates for say Java deve

It does depend what you do, and how you do it, but the results suggest that your scale needs to go a lot higher; typical London contract rates for say Java development are about $700 a day, tend to last 3 / 6 months, e.g. $42-84k. Probably 2/3rds of that if you are a js dev, or 2x that if you know your investment banking and grid computing.