I grow ambitious brands in Google and AI search. I also build the tools that measure it.

Esteve Castells Independent consultant. Former Head of SEO at Adevinta. Based in Barcelona.

SEO & GEO consulting for ambitious brands

Building products keeps me sharp. Consulting is where I put all of it to work for you, directly and without layers, on the problems that actually move revenue.

SEO Consulting: Technical and strategic SEO for large sites, marketplaces, classifieds and SaaS. The complex problems, cut down to what moves traffic.
GEO & AI Search Optimization: If you're seeing your traffic from AI search such as ChatGPT, Gemini, Grok, AI Mode or Perplexity grow, and want more, reach out.
Growth Advisory & Fractional CMO: A strategic partner for startups and scaleups, as I have been for companies like Manglai.
Beyond boundaries: Market research, M&A and integrations, AI training for your team, tech consulting. If it doesn't fit a box, let's talk about it.

Globally recognized

I have notably identified and reported critical bugs in the Google crawler.

Battle-hardened

I have optimized websites that receive over 4 million daily clicks from Google, and have served for 5 years as the Head of SEO for Adevinta, a leading tech company in Europe, with monthly organic visits exceeding 500 million.

Directly from me to you

No account managers, no intermediaries, no junior SEO or intern interfacing - just straightforward expertise from someone who's grown international platforms.

Trusted by teams at

Your brand next?

But don't just take my word for it

Here's what some pretty awesome people have said about working with me (and feel free to ask for a reference!)

I'd highly recommend Esteve. He's probably the top marketplace SEO expert in all of Europe, with a rock solid track record. He's a great guy, business-focused, zero-bullshit, and the real-deal kind of pro that's so difficult to find. I've had the pleasure of working with him and can personally vouch for his expertise and professionalism.

Pere Quintana

CMO at Fotocasa & Habitaclia (Adevinta)

Esteve has had a transformational impact at YunoJuno. His SEO expertise is second to none. Deeply insightful and navigating complex challenges with ease. Esteve is a rare find, combining technical acumen with commercial flair and a relentless drive for impact.

Runar Reistrup

CEO at YunoJuno

Collaborating with Esteve on various projects has been a pleasure. He is a versatile professional with extensive experience in large-scale projects. Esteve is hands-on, always engaging with teams and exploring new tech innovations.

Jaume Fontal

Co-Founder & CPTO at Manglai

Esteve's SEO expertise was key to the early success of Labhouse's new website, Invoice Fly. He drove our SEO and SaaS content strategy with a data-driven approach. Highly recommended!

Roger Howroyd

SEO Specialist at Labhouse

Esteve is probably one of the best professionals I have met in my career. His experience, ambition and professional trajectory make him a reference in his field.

Oriol Torres

Co-Founder & CEO at Menorca Republik

I had the pleasure of working with Esteve, an exceptional SEO expert. His deep knowledge and strategic approach led us to over 30 million page views per month for our site, Psicología y Mente. He is also a natural leader, driving teams efficiently to achieve outstanding results.

Bertrand Regader

Founder at Psicología y Mente

Esteve is one of the biggest SEO experts in the industry I have ever worked with in my whole career. Thanks to his great ideas, our SEO improved more than 115% YoY, resulting in millions of additional page views.

Vladan Paunovic

Senior Engineering Manager at Shpock

Esteve is the most impactful leader I had the chance to work with. I feel privileged that I had the possibility to work with Esteve. He makes a difference and enables others to do the same.

Norbert Hires

Head of SEO at Pet Media Group

I also build products

Software I founded and run. The data and tooling behind it feed straight into my consulting work.

LLM Pulse

FounderAI search visibility

The all-in-one AI search visibility and reputation platform. Track how ChatGPT, Gemini, Perplexity and AI Overviews talk about your brand, and what to do about it.

llmpulse.ai MCP server

DomScan

FounderWeb intelligence APIs

Domain, web, security and identity intelligence APIs to investigate infrastructure and automate monitoring workflows.

domscan.net MCP server CLI

Seopatía

AuthorNewsletter

The leading SEO newsletter in Spanish. SEO in all its forms, with touches of technology, business and AI.

Open source

Small tools I built because I needed them, published on GitHub for anyone to use and improve.

MacFanOptimizer

Automatic, temperature-driven fan control for Apple Silicon MacBooks. A free alternative to Macs Fan Control.

Rust · SwiftUI · macOSGitHub
MacDetour

A menu bar switch that sends only blocked addresses, like LaLiga's IP blocks in Spain, through your own server. Everything else stays untouched.

Rust · macOSGitHub
MacDimScreen

A free f.lux alternative for Mac. Warms and dims your screen after sunset, including on M5 Macs.

Rust · macOSGitHub
GeoStess

A free geography game: countries, cities, flags and population. Solo, pass-and-play or online rooms with up to 10 players.

TypeScript · PWAPlay GitHub