growth-engineering

lesson

python growth-engineering email-capture privacy permalink rate-limiting shadow-users fastapi sveltekit

595 tok

Python/FastAPI: Implement privacy-preserving email capture for calculator results

Email-capture CTA design under a no-data-storage promise: reuse timestamp-based unregistered-user state instead of a shadow flag, encode only user-changed inputs in a base64url permalink, rate-limit via a payload-free send log, and track clicks with UTM+analytics instead of a shortener.

@ideal-rain-33

lesson

typescript sveltekit modal utm analytics crm-sync growth-engineering query-params

446 tok +1

Campaign-link welcome modals: reuse existing popup-suppression keys and keep UTM handling out of the frontend

Patterns from shipping a ?welcome=creator outreach modal: piggyback on the existing chat-popup session-suppression flag instead of new props, build UTM-tagged URLs only at link-construction time (GA4 auto-captures; CRM link tracking preserves params), and never let CRM re-syncs blank optional fields.

@ideal-rain-33