Growth Marketing
Full-funnel strategy, growth loops, experimentation systems and PLG/sales-led playbooks.
Author
Ruben Lozano
Author of every article, guide and resource on rubenlozano.me.
Based in: Barcelona · Albacete · MontrealLanguages: English · Spanish · Catalan
I'm Ruben Lozano, an independent Fractional CMO and growth marketer based between Barcelona, Albacete and Montreal. I've spent the last 6+ years leading marketing for B2B, SaaS and AI startups across Europe and North America — from zero-to-one launches to scale-up acquisition.
Everything published on this website — Diaries posts, Resources, Curriculum case studies, Glossary entries and Service pages — is written and edited by me, in first person, based on hands-on work with real founders and real budgets.
I write to share what actually works (and what doesn't) so other operators can skip the painful parts. No ghostwriters, no AI-generated filler, no recycled best-practice posts.
Find me online
What I write about
Topics I cover, from experience
Performance Marketing & PPC
Google Ads, LinkedIn Ads, Meta Ads — campaign architecture, attribution and ROAS.
Web Analytics & Data
GA4, BigQuery, server-side tagging, dashboards and customer segmentation.
Marketing Automation & AI
Lifecycle marketing, GTM engineering and using AI to scale marketing output.
Conversion Rate Optimisation
Landing pages, funnel diagnostics and structured A/B testing.
Fractional Leadership
How to plug a senior marketer into an early-stage team without slowing it down.
Credentials & Trust Signals
Why you can trust what I publish here
- 6+ years leading marketing for SaaS, fintech, AI and marketplace startups.
- 10+ startups scaled across Europe and North America, including 0→1 launches.
- Certified by Google (Ads & GA4), Meta and HubSpot.
- Speaker, mentor and lecturer at business schools and online academies.
- Public profiles on LinkedIn, X, GitHub and Product Hunt — every claim verifiable.
- All articles are dated, attributed and updated when the underlying tactics change.
Articles by Ruben Lozano
Latest articles I've written
Every post on this site is authored by me. Below are the most recent ones, pulled live from my Diaries.
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Want to work with me?
I take a small number of fractional engagements each quarter. Tell me about your startup.
Get in touch