When you build an Ajax based website and want to be SEO friendly, there are a couple of techniques you have to apply. Back in 2009, Google made a proposal on how to make your Ajax pages crawlable. Later on in 2014, they updated their advice saying the following:
Historically, Google indexing systems resembled old text-only browsers, such as Lynx, and that’s what our Webmaster Guidelines said. Now, with indexing based on page rendering, it's no longer accurate to see our indexing systems as a text-only browser. Instead, a more accurate approximation is a modern web browser.