https://yashsachdeva.com/categories/backend/ Recent content in Backend on Tech Blog Hugo -- gohugo.io en © 2026 Yash Sachdeva Thu, 02 Apr 2026 10:12:19 +0530 https://yashsachdeva.com/posts/high-concurrency-flash-sale-systems/ Thu, 02 Apr 2026 10:12:19 +0530 https://yashsachdeva.com/posts/high-concurrency-flash-sale-systems/ <h2 class="relative group">Introduction <div id="introduction" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#introduction" aria-label="Anchor">#</a> </span> </h2> <p>A High Concurrency flash sale system is a system that is designed to handle a large number of concurrent users who are trying to purchase a limited number of items in a short period of time.</p> https://yashsachdeva.com/posts/load-balancers-and-consistent-hashing/ Sun, 29 Mar 2026 12:57:32 +0530 https://yashsachdeva.com/posts/load-balancers-and-consistent-hashing/ <p>Imagine a small app where each client talks directly to a specific server, say <code>https://10.0.0.1:8080</code>. As traffic grows, that one server becomes a bottleneck, and if it crashes, the whole app is effectively down for any client pointing at it.</p> https://yashsachdeva.com/posts/how-to-cache/ Sat, 28 Mar 2026 08:42:23 +0530 https://yashsachdeva.com/posts/how-to-cache/ <p>Modern APIs frequently access databases, or complex business logic that introduce significant latency and consume CPU and I/O resources. Without caching, every request pays the full cost of database queries, network calls, and computation. This can lead to slow response times and poor scalability as traffic increases.</p>