Can I vibe code Optimizely?

Build a lightweight, self-hosted client-side A/B testing engine and script tag. 1. DATA MODEL: Create a PostgreSQL schema with tables: `experiments` (id, key, status, traffic_allocation_percentage), `variations` (id, experiment_id, key, payload_json, weight), `audiences` (id, experiment_id, targeting_rules_json), and `experiment_events` (id, experiment_id, variation_id, visitor_id, event_name, value, timestamp). 2. SCRIPT DISTRIBUTION: Build a Node.js/Fastify microservice that serves a minified vanilla JavaScript snippet (`ab.js`) cached via Redis. The script reads a client cookie `ab_visitor_id` (or generates a UUIDv4), fetches active experiments for the current URL path, evaluates user bucket assignment using a deterministic MurmurHash3 algorithm on `visitor_id + experiment_key`, and executes variations. 3. FLICKER PREVENTION & VARIATION EXECUTION: The JS snippet must support two variation types: JSON payload (for developer use) and CSS/DOM mutations (e.g., changing innerHTML, swapping attributes, or adding custom CSS classes). Implement a mutation observer or early sync execution mechanism to apply DOM modifications without causing UI flicker. 4. EVENT TRACKING & ANALYTICS: Provide a window method `window.abTrack(eventName, value)` that sends beacon requests (`navigator.sendBeacon`) to the Fastify ingestion endpoint. Store events in PostgreSQL. Build an admin dashboard endpoint that computes conversion rates, sample ratio mismatch (SRM) checks using Chi-Square, and basic two-proportion z-tests for conversion rate statistical significance. 5. OUT OF SCOPE: Visual WYSIWYG editor, sequential testing algorithms, server-side SDKs, multi-armed bandits.

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