Muhammad Zulqarnain🧵 Thread: How I scaled Quran.com to 50M+ monthly users — without rewriting everything 👇
1/ Start with ruthless profiling. Don't guess — measure.
2/ Cache aggressively at the edge (CDN + Redis)
3/ Split monolith only when team friction > tech debt
4/ Next.js ISR was our secret weapon for content pages
5/ Database reads >>> database writes. Index accordingly.