buildwith.rex bloghttps://buildwithrex.me/blog/Tech and computer science, explained clearly. Vertical vs horizontal scaling: when to use whichhttps://buildwithrex.me/blog/vertical-vs-horizontal-scaling/https://buildwithrex.me/blog/vertical-vs-horizontal-scaling/Wed, 07 Oct 2026 00:00:00 +0530Bigger server or more servers? Both are right in the right place. The interview answer, real AWS prices, and the two mistakes where money quietly burns. What is system design? A beginner's maphttps://buildwithrex.me/blog/what-is-system-design/https://buildwithrex.me/blog/what-is-system-design/Wed, 07 Oct 2026 00:00:00 +0530Ten users and everything works. A million at once and the server falls over. A plain-language map of the five pieces every large system is built from.