lets start with creating a simple SaaS application where the funnel is
and were going to be using these tools for feature flag, a/b testing, analytics, :
with this growth engineering stack:
| Pillar | Tool / Example | Core Question It Answers |
|---|---|---|
| 1️⃣ Event tracking | PostHog | What happened? |
| 2️⃣ Feature flags & experiments | PostHog | What caused it? |
| 3️⃣ User identity & properties | PostHog + Supabase | Who did it? Why? |
| 4️⃣ Feedback / iteration loops | Retool | What should we do next? |
First lets start by creating all of the UI for this funnel…


Then lets start by setting up Posthog… what youll need is: