The optimization of the referencing (SEO) of a site comprises different sectors of intervention, which can involve teams with various specialties.
For my part, I work on the SEO optimization in the site , that is to say that which is carried out upstream, during the design and / or redesign, and which takes into account the SEO objectives to design a site architecture, page architecture, and the use of all techniques (code, smart urls, microdata markup, internal link linking, editorial advice, etc.) that will optimize the positioning of your site in search engines.
I will also be able to accompany you on other topics related to SEO, or advise you in the choice of a specialist service provider: acquisition of external links, sponsored links (Google Adwords, Facebook, Bing, etc.) or retargeting campaigns.