Yes, we work hard to ensure all our themes SEO friendly by using semantic markup, valid standard code and tags.
WordPress helps ensure your site is presented well to search engines. If you wish to go further, we recommend consulting Yoast’s WordPress SEO guide and using the WordPress SEO plugin, which adds additional configuration options and SEO features to your site.
How a site ranks is ultimately down to how you use your WordPress theme, as content is the king when it comes to SEO and good user engagement.