First party data and Server Side Tagging

A server layer gives a company more control over processing events before sending them to external tools. It does not automatically make data lawful or replace consent, minimisation and agreements with recipients.

Map the data flow

For every event, we record the source, fields, purpose, legal basis, recipient and required retention. Data necessary to provide the service is separated from analytics and advertising. We do not collect a field merely because it might be useful later.

Design a controlled layer

With server-side tagging, a request reaches a server container that identifies it, transforms it and runs suitable tags. Google documentation emphasises control over the shape of data and where it is sent. Each recipient remains an explicit configuration decision.

Documentation: Google Tag Manager — server-side tagging.

Preserve the user's choice

The server must not restore identifiers or send data contrary to consent state. Client and server logic use the same category model. We test a consent change and requests that arrive after a delay.

Do not promise complete measurement recovery

A server layer can reduce some technical loss and organise integrations, but it does not guarantee complete data. Reporting separates the impact of blocking, consent, implementation, modelling and identifier quality.

Maintain and observe

We monitor client and tag errors, latency, cost and schema changes. A new field or partner receives a purpose and scope review. On representative scenarios, we compare the incoming event with the data sent onward.