A good SEO company will have past clients, so use the search engines and see where they are currently positioned.
Doing a simple background research will yield enough information for you to know how good they are at what they do. Since they have testimonials on their site, they should have links in the signatures. What you really have to do is study the sites for the SEO companies, and then work to verify everything you can. The SEO company also needs to let you know about the freely available SEO statistics. What you will want to know is ranking progress plus how the backlinking campaigns are coming along. But if they come right out and state that their premium reports will carry a charge, then you should find someone else. You also may want to only deal with local people, and the reason for that is you can visit them. You can't afford to take risk here; so there has to be a high level of transparency.
Look for those SEO companies that are not lagging behind the technology curve in any way. You want people who you believe are staying on top of the relevant news and progressions in the industry. They should know exactly what needs to be done to give you the best results. A good way to analyze this is to look at their blog. They may not have a lot of articles on their site, so this one is a toss up and does not mean they are clueless.
You have to do a number of things to ensure that you are hiring the right SEO company. You obviously don't want to go for a company that will jeopardize your site's reputation in the search engines. In the long run, your choice of SEO company will matter; so taking effective steps to hire the right company will help you secure your position in the search engines. All in all, doing what needs to be done when hiring the right SEO company is important when it comes to getting results.
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