Gaps & Engineering Roadmap

Identified Gaps & Upgrades

1. Redis Caching Tier: Add Redis to cache frequently accessed slugs (short_url:xyz -> full_url) to offload 90% of read traffic from MongoDB.
2. Malware & Phishing Scanning: Integrate Google Web Risk API to asynchronously verify long URLs before shortening.
3. Geo & Device Telemetry: Parse the User-Agent and CF-IPCountry headers to store browser, OS, and country metrics for every click.