GTM + Onboarding Integration for SaaS

I need someone to set up Google Tag Manager on my SaaS platform (white-label, no backend access).

The main tasks are:

Configure GTM to extract user identity (ID/email) from localStorage, cookies, or DOM.

Push that data into the Data Layer for use in other tools.

Integrate Usetiful so onboarding prompts show with the correct user identity.

Connect GTM events (e.g. signup, first login, card created) to an automation tool (Zapier/Make/Klaviyo) so emails fire at the right time.

Ensure everything is tested in GTM Preview and works across page reloads.

This is not just ad tracking — it’s about product onboarding + automation flows.

Please share examples where you’ve:

Implemented GTM variables pulling data from localStorage/cookies.

Integrated onboarding tools (Usetiful, Intercom, etc.)

Set up email flows triggered by GTM events.