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Alejandro Castaño
enesde
Open to roles in Berlin — from July 2026

Marketing Data Analyst · Berlin

I turn marketingdata into decisions.

Analytics, technical SEO & GEO, paid media and AI-driven automation. I build the tracking, model the data, and ship the systems that make marketing measurable.

See my workGet in touch
01 — About

A marketer who reads the data.

I'm Alejandro Castaño, a data-driven marketer with 4+ years across technical SEO, paid media and web analytics, finishing an MSc in Business & Marketing in Germany. I sit where marketing meets data and automation: GA4 and server-side tracking, Google & Meta Ads, and custom tooling that removes manual work and improves data quality.

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What I do

Four things I do well.

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Web analytics & tracking

GA4, Google Tag Manager and server-side tracking with Meta CAPI. I design the measurement so the numbers are trustworthy before anyone reports on them.

  • GA4
  • GTM
  • Server-side
  • Meta CAPI
  • Looker Studio
  • SQL
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Technical SEO & GEO

Crawlability, structured data and Core Web Vitals, plus optimizing for AI search (AI Overviews, ChatGPT, Perplexity). Getting found by people and by machines.

  • Schema.org
  • Ahrefs
  • SEMrush
  • Search Console
  • CWV
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Paid media

Google Ads (Search, Performance Max, Shopping) and Meta Ads across e-commerce clients: budget pacing, tracking integrity and ROAS.

  • Google Ads
  • Meta Ads
  • PMax
  • Shopping
  • Merchant Center
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AI & marketing automation

I build the systems, not just use the tools: n8n workflows, Google Apps Script, API integrations and custom MCP servers — and I validate the output against the source.

  • n8n
  • Apps Script
  • MCP
  • LLM workflows
  • Python
Selected work

Things I built.

AI-driven marketing automation
2023 — · Design & build

AI-driven marketing automation

End-to-end automation for lead handling and reporting: server-side Meta CAPI events with deduplication, n8n workflows, Google Apps Script back-ends, and a custom MCP server. Removes manual work and improves data quality — with output validated against the source.

  • n8n
  • Meta CAPI
  • Apps Script
  • MCP
Getting brands cited by AI search
2025 — · SEO & GEO

Getting brands cited by AI search

Generative Engine Optimization on live e-commerce: structured data / JSON-LD, citable passages and llms.txt, measuring visibility in AI Overviews and ChatGPT before and after. Turning technical SEO into AI-search presence.

  • GEO
  • AEO
  • Schema.org
  • llms.txt
Trustworthy GA4 measurement
2023 — · Analytics engineering

Trustworthy GA4 measurement

GA4 + GTM with server-side tracking and Meta CAPI to fix attribution and data quality across e-commerce brands. Dashboards in Looker Studio so decisions run on numbers people can trust.

  • GA4
  • GTM Server-side
  • Meta CAPI
  • Looker Studio
Writing & notes

Latest from the log.

Why I built this site

A home for everything I do — the analytics, the SEO, the automation — and a place to share what helped me along the way.

Self-hosting fonts: a Core Web Vitals and GDPR win

Loading fonts from Google's CDN costs you speed and, in Germany, legal peace of mind. Here's why this site self-hosts every typeface.

For others

Resources I share.

Courses worth doing, repos worth cloning, opportunities worth knowing. A running list of things that helped me, in case they help you.

Browse resources →
  • Google Data Analytics Certificate
  • Mode SQL TutorialFree
  • Google SkillshopFree
  • Ahrefs & Semrush AcademiesFree
  • HubSpot AcademyFree