Cristhian Velasquez - Data Analyst | ContraWork by Cristhian Velasquez
Cristhian Velasquez

Cristhian Velasquez

GA4/GTM measurement & server-side, from tracking to insight

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Madrid, Spain

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Madrid, Spain

Cover image for Built the AI-traffic measurement layer
Built the AI-traffic measurement layer on my own site: correct GA4 capture of ChatGPT/Perplexity referrals, LLM crawler segmentation (GPTBot, OAI-SearchBot, PerplexityBot) and a BigQuery attribution pipeline connecting cited prompts to sessions. The exact method I deploy for clients.
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Cover image for Floodlight recording zero conversions despite
Floodlight recording zero conversions despite confirmed traffic (automotive): identified 4 simultaneous causes, fixed the pixel and sequencing, validated in Preview.
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Cover image for Consent Mode v2 audit on
Consent Mode v2 audit on a fashion eCommerce: 154 tags reviewed, gates added to 15 server-side tags. Zero personal data sent without consent before go-live.
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Cover image for GTM container migration for a
GTM container migration for a hotel-distribution provider without breaking measurement: 177→102 variables, 21→7 tags, no broken references, legacy Universal Analytics retired.
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