I write 100% technical blog posts, and I also guest write for a prominent [$programming-laguage] blog. People search the common problem, I provide well written solutions.

I guess that proves to potential clients that:

A) I can speak English at a native level. B) I'm a good engineer with an interest in my field. C) The most important one: I'm a good communicator.

In a team environment you want someone you can communicate with, first and foremost.