Security8 min read

GDPR Compliance for Websites: A Developer's Guide

GDPR fines have exceeded billions since 2018. Most violations are caused by developers who did not know what the law requires. This guide tells you exactly what to build.

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GDPR Compliance for Websites: A Developer's Guide

Cookie Consent Done Properly

A GDPR-compliant cookie banner requires granular consent categories, the ability to decline all non-essential cookies, and actual enforcement of consent choices. Banners that pre-tick marketing cookies or make rejection difficult are illegal and actively fined by regulators.

What Data You Can Collect and Why

Every piece of personal data you collect must have a lawful basis: consent, contract, legitimate interest, or legal obligation. Document your data processing activities in a Record of Processing Activities — this is not optional for organisations processing personal data at scale.

Right to Erasure and Data Portability

Users can request deletion of their personal data and export of their data in a portable format. Build these capabilities into your user management system from the start — retrofitting them later is expensive and error-prone.

Privacy by Design, Not Afterthought

GDPR Article 25 requires privacy by design — collect only necessary data, encrypt sensitive fields at rest and in transit, set data retention periods and automated deletion, and conduct Data Protection Impact Assessments for high-risk processing activities.

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