Data warehouses are purpose-built for analytical queries — aggregations, joins, and scans across billions of rows that would bring an […]
Greedy algorithms make the locally optimal choice at each step, hoping to find the global optimum. Unlike dynamic programming which
Netflix serves over 200 million subscribers across 190 countries, streaming billions of hours of video per month. Designing a video
The CAP theorem is the most cited theorem in distributed systems — and the most misunderstood. It states that a
Binary search is deceptively simple in concept but tricky in implementation. Off-by-one errors, wrong boundary conditions, and infinite loops are
A distributed task scheduler executes jobs at specified times or intervals across a fleet of workers. It powers cron jobs,
In a microservices architecture, services must find and communicate with each other despite dynamic scaling, deployments, and failures. Service discovery
Union-Find (Disjoint Set Union) is a data structure that tracks elements partitioned into non-overlapping sets. It supports two operations in
Designing a distributed key-value store is a foundational system design question that tests your understanding of storage engines, replication, partitioning,
Time-series databases are optimized for storing and querying timestamped data: application metrics, IoT sensor readings, financial market data, and infrastructure
String pattern matching — finding a pattern within a larger text — is a fundamental algorithm that powers text editors,
Real-time collaborative editing — where multiple users simultaneously edit the same document — is one of the hardest problems in
Database indexes are the single most impactful tool for query performance. A missing index can make a query 1000x slower,
Monotonic stacks and queues are specialized data structures that maintain elements in sorted (increasing or decreasing) order. They solve a
Designing a photo-sharing platform like Instagram tests your ability to handle media-heavy workloads, social graph queries, feed generation, and content
