Who is behind Agence SEO Paris?
You are right to ask. An agency that asks you to entrust it with your Google visibility owes you transparency about who it is, where its expertise comes from, and how it works. Here is the answer, without evasion.
Éric St-Cyr and his team, trained on the American battlefields
My name is Éric St-Cyr. I am a Quebecer and the founder of ProStar SEO. For more than ten years, our team has practiced organic search for a hundred or so clients across North America and Europe — and while I sign this page, the results we deliver are first and foremost a collective achievement.
Our expertise was built where the competition forgives nothing: the most aggressive American markets on the web. Online casino. Plastic surgery. Cannabis. Dating sites. Industries where Google Ads is banned or severely restricted, where organic search is the only acquisition channel, and where every lost position represents tens of thousands of dollars in revenue.
In those markets, nobody survives on intuition or recipes copied from a blog. You survive by testing, measuring, and executing better than competitors who pour seven-figure budgets into SEO. That is the school that forged our method — the method of a multicultural team of SEO specialists, copywriters, and developers who work in French and English alike.
A story of reinvention, told without varnish
Before SEO, there was a first life. Born near Trois-Rivières, Québec, I built a career in international finance — first at a Canadian bank, then at a Cayman Islands firm. That chapter ended in a public downfall that cost me almost everything. I tell it plainly in À l'ombre du soleil, a memoir published in 2016 about high finance, offshore banking, and the rebuilding that followed.
What matters is what came next: past fifty, starting from zero, I chose organic search and built ProStar SEO page after page, client after client. That lived experience of loss and reconstruction explains how we practice SEO: no shortcuts, no false promises, and an obsession with measurable results. I kept the rights to the book and would rather have it read than sold: ask me for a copy via WhatsApp and I will send it to you.
A family of specialized SEO agencies
Agence SEO Paris is not a standalone operation: it is the French arm of a group of SEO agencies built vertical by vertical, each in a demanding market. ProStar SEO is the multi-sector flagship; CannabisSEO.ai covers cannabis, CBD, and dispensaries; Plastic Surgery SEO serves plastic surgeons; Med SEO healthcare professionals; Dentist SEO dental practices; and SEO for Contractors the building trades and home services.
In total, more than one hundred clients supported, from the local shop to the national brand. Our largest client generates more than ten million organic clicks per month — the kind of scale only well-built SEO, compounding over time, can produce. It is this capital of experience, forged in the most contested markets, that this agency puts to work for the Paris market.
A scientific approach to SEO
We believe in one simple thing: SEO is an engineering discipline, not an act of divination.
Every recommendation we make rests on a test or on measured data. We analyze the pages that actually dominate the search results for your keyword: their contextual density, their semantic entities, their content architecture, their link profile. Then we build pages calibrated to exceed those benchmarks, and we measure the result.
When a hypothesis fails, we say so and we adjust. When it succeeds, we document it and we replicate it. This test-measure-iterate loop is what separates scientific SEO from opinion-based SEO. Search engines evolve constantly, including answer engines like ChatGPT, Claude, and Perplexity, which are redefining online visibility today. Only a method grounded in continuous experimentation can keep up with that pace.
Why an SEO agency in Paris?
Let's speak frankly, with all the respect the French SEO ecosystem deserves — it counts some excellent practitioners.
The American search market moves faster, not because American SEOs are more talented, but because competitive intensity there forces innovation. When hundreds of players fight over the same queries with massive budgets, the techniques get refined, tested, and validated at a speed few markets ever see. The practices that dominate American SERPs today generally reach French-speaking Europe a few years later.
For you, that is a concrete opportunity: apply in Paris, right now, methods already proven in the most competitive environments on the web, while your competitors are still working to yesterday's standards. That is exactly what this agency offers you — the best of both worlds: North American methodological rigor, deployed with full command of the French-speaking market, its language, and its culture.
What you can expect from us
Honest expertise starts with clear commitments.
We never promise the first position: anyone who guarantees it is lying to you, because nobody controls Google's algorithm. We promise a method: quantified competitive analyses, documented deliverables, tracked indicators, and reports that show what is progressing and what needs to be corrected.
We work without long-term contracts. Our clients stay because the results convince them, not because a clause holds them. After more than ten years and around a hundred clients, that policy remains our best proof of trust.
And we explain what we do. SEO should never feel like a black box. You will understand every action taken on your site, and why it was taken.