I have done several link building tasks that required good English skills , such as guest posting which require communication via Email address, I also have done article writing in past. I have done it earlier under this project https://www.freelancer.com/projects/Custom-Project-Mar.4326093.html you may ask employer about it.
For bad link identification we will be using number of different techniques and tools, but we will check each link manually and decide whether it is good or bad according to google guide line and according to our experience.
After catagorizing Good and Bad Backlinks, we will cleanup bad links by first manually contacting website owners and then using some tools to remove them.
Record of everything we do for this project will be maintain in excel file.
Thanks.