⏱ 9 min read Data Lake Architecture Low-Level Design A data lake is a centralized repository that stores structured and unstructured data at any Read article

⏱ 9 min read Streaming ETL Pipeline Low-Level Design A streaming ETL pipeline continuously consumes events from a message broker, transforms them in real Read article

⏱ 9 min read Database Schema Migration System Low-Level Design A schema migration system manages the evolution of a database schema alongside application code. Read article

⏱ 9 min read Query Optimizer Low-Level Design A query optimizer transforms a parsed SQL query into an efficient execution plan. The optimizer evaluates Read article

⏱ 5 min read Why Indexes Matter A database index is a data structure that enables fast lookup of rows without scanning the entire Read article

⏱ 4 min read Why API Design Matters in Interviews API design questions appear in senior system design interviews: “Design the Twitter API,” “Design Read article

⏱ 7 min read Why Multi-Region? Single-region deployments have two problems: (1) Latency — a user in Tokyo making a request to a US-East Read article

⏱ 6 min read What Is a Time Series Database? A time series database (TSDB) stores sequences of timestamped values — metrics, sensor readings, Read article

⏱ 6 min read What Is Object Storage? Object storage stores unstructured data (images, videos, backups, logs) as discrete objects with a flat namespace Read article

⏱ 6 min read Overview A notification service delivers time-sensitive messages to users via push notifications (mobile), SMS, email, and in-app alerts. WhatsApp sends Read article