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A multi-region architecture deploys services and data across multiple geographic regions to achieve low latency for global users, disaster recovery, […]

Real-time communication between client and server requires pushing data from server to client without the client repeatedly polling. Three main

A distributed job scheduler executes tasks at specified times or intervals across a cluster of workers. It must handle at-least-once

A feature flag system enables runtime toggling of application features without deploying code. It decouples deployment from release and enables

System design interviews test your ability to think at scale, communicate trade-offs, and structure ambiguity into actionable plans. A repeatable

Single-Threaded Event Loop Redis processes all client commands on a single main thread sequentially. This design eliminates the need for

Process Architecture PostgreSQL uses a multi-process architecture rather than threads. The postmaster is the root process: it listens for incoming

What Is a Virtual Memory System? Virtual memory is a foundational OS abstraction that gives each process the illusion of

Why CPU Cache Optimization Matters Modern CPUs execute instructions in nanoseconds, but DRAM access takes ~80ns — roughly 200 CPU

Concurrency is one of the hardest problems in systems design. Bugs are non-deterministic, hard to reproduce, and can corrupt data

Relational databases have been the default choice for decades, and for good reason — SQL is powerful, ACID transactions are

A data warehouse is a system optimized for analytical queries across large volumes of historical data. Unlike transactional databases, warehouses

Compression is one of the highest-leverage primitives in systems design. It reduces storage cost, cuts network bandwidth, and often improves

DNS (Domain Name System) is the internet’s distributed directory service — it translates human-readable hostnames like www.example.com into IP addresses

An audit log is an immutable, chronological record of every significant action taken in a system — who did what