Large SEO companies tend to have a successful portfolio. Most of the processes are automated. This has both pros and cons. The main problem is that the account manager usually communicates with you. You receive reports, but more often, you do not know exactly who is working on promoting your site.
No one bothers to contact several specialists in contextual advertising at once and after a while draw conclusions, which of them works more efficiently and professionally.
You can find a SEO specialist by placing an ad on Pavement Sign. This is the easiest way to post and find the information you need. Moreover, it will cost you significantly less than a regular post on some advertising site. Many people ignore the Internet, but it is impossible to ignore Pavement Signs when they float past you as a bright spot when you are walking down the street.