Technical audit · 06.06.2026

zalando.ee

Europe's Largest Online Fashion and Footwear Retailer

Europe's largest online fashion retailer. Usercentrics is present — but GTM carrying GA4 loads 1.2 seconds before the banner. By the time consent appears, analytics is already initialized.

Request timeline

+373 ms · prior to consent
Sentry (js-de.sentry-cdn.com) — an EU instance (Germany), for error monitoring. Data stays within the EU.
+1234 ms · prior to consent
GTM (gtag/js?id=G-MDW1S9PQPW) — GA4 initializes 1475 ms before Usercentrics.
+2709 ms · banner
Usercentrics loads (app.usercentrics.eu). Configuration in Estonian (et.json).
+3400 ms · after the banner
GTM-T3W9FX — the main Tag Manager container loads.
+3757 ms
Google Ads (AW-1006368194) — a conversion tag loaded via GTM.
+3963 ms
Google Ads collect (pagead2.googlesyndication.com) — a page_view event is transmitted to the USA.

Transfer timings

+373 ms js-de.sentry-cdn.com

Sentry EU (Germany). Data stays within the EU

+1234 ms www.googletagmanager.com

GA4 G-MDW1S9PQPW initialized

+2709 ms app.usercentrics.eu

Usercentrics loads

+3400 ms www.googletagmanager.com

GTM-T3W9FX main container

+3963 ms pagead2.googlesyndication.com

Google Ads page_view collect

Detected trackers

Indicators of GDPR non-compliance

Context

Zalando SE is Europe’s largest online fashion and footwear retailer, headquartered in Berlin. zalando.ee is the Estonian version of the platform. For GDPR purposes, the data controller for EU users is Zalando SE, and the supervisory authority is the German Berliner Beauftragte für Datenschutz und Informationsfreiheit. HAR: 254 requests, 11 domains.

What has been done correctly

Zalando uses Usercentrics, a serious European CMP, with configuration available in Estonian (translations-et.json). Sentry is deployed on an EU instance (js-de.sentry-cdn.com, Germany) — error data stays within the EU. The site’s own image infrastructure (ztat.net) is used, with no Google CDN or Cloudflare involved for media. Zero Set-Cookie responses — cookies are set only after consent.

The main problem — loading order

GTM carrying GA4 (G-MDW1S9PQPW) loads at +1234 ms. Usercentrics appears at +2709 ms. The gap is 1475 milliseconds.

This means GA4 initializes before the user ever sees the consent banner. Technically, GA4 may withhold sending data until it receives a consent signal from Usercentrics — this depends on the Consent Mode v2 configuration. But the mere fact that the analytics script loads before the banner is itself a violation of the privacy-by-default principle: analytics should not even initialize prior to consent.

After Usercentrics loads, the main GTM container (GTM-T3W9FX) and Google Ads (AW-1006368194) activate via it. The Google Ads collect call (+3963 ms) is transmitted to the USA — this may mean advertising is activated by default without explicit consent, or that Consent Mode treats the loading of Usercentrics as implicit consent.

Sentry EU — the correct choice

This is the second site in the series, after IIZI, where Sentry uses an EU instance. Zalando has gone further — js-de.sentry-cdn.com indicates a CDN with German nodes. A deliberate choice that resolves the issue of data transfer outside the EEA for error monitoring.

Conclusion

Zalando has invested serious effort into compliance: Usercentrics with Estonian localization, Sentry EU, its own media infrastructure. But GTM loads 1.5 seconds before the banner — and that alone is enough to do not comply with the principle of consent preceding processing. The difference between good architecture and correct architecture here lies in the order in which scripts load.

Evidence

How to verify: download the file and compute its checksum — sha256sum file.har (Linux, macOS) or certutil -hashfile file.har SHA256 (Windows); it must match the one shown. The conclusions apply to the scope of this measurement — see the limitations of the method.

Original (audit)
HAR file: ee/zalando-ee-2026-06-06.har
SHA-256: 71b241775707849064e4050318829cb3b044ff4f18053a7265176d58960288c9
Re-check snapshot
Awaiting changes
HAR files are stored on EU infrastructure (Proton Drive). SHA-256 is published for integrity verification.