CDN Design Low-Level Design
5 min read What is a CDN? A Content Delivery Network (CDN) is a distributed network of edge servers placed close to users […] Read article
System Design
System Design
Configuration Management System Low-Level Design
5 min read What is a Configuration Management System? A configuration management system externalizes application settings — database URLs, feature flags, API keys, Read article
Algorithms, Coding Interview Questions
Interval Algorithm Patterns for Coding Interviews
5 min read Why Interval Problems Matter in Interviews Interval problems appear in scheduling, calendar, and range queries — and in coding interviews Read article
System Design
Audit Log System Low-Level Design
5 min read What is an Audit Log? An audit log is an immutable, append-only record of every significant action taken in a Read article
Algorithms, Coding Interview Questions
String Algorithm Patterns for Coding Interviews
6 min read Why String Algorithms Matter in Interviews String problems are ubiquitous in technical interviews at Google, Meta, Amazon, and Microsoft. Key Read article
System Design
GDPR Data Deletion System Low-Level Design
5 min read What is GDPR Right to Erasure? GDPR Article 17 gives EU users the “right to be forgotten” — they can Read article
System Design
Time-Series Database Low-Level Design
5 min read What is a Time-Series Database? A time-series database (TSDB) is optimized for storing and querying data points indexed by time: Read article
Algorithms, Coding Interview Questions
Graph Algorithm Patterns for Coding Interviews
6 min read Why Graph Algorithms Matter in Interviews Graph problems appear constantly in technical interviews because they model real systems: social networks Read article
System Design
Newsletter System Low-Level Design
5 min read What is a Newsletter System? A newsletter system manages subscriber lists, drafts and schedules email campaigns, personalizes content, and tracks Read article
System Design
Image Processing Service Low-Level Design
5 min read What is an Image Processing Service? An image processing service handles on-demand or batch transformations of images: resize, crop, compress, Read article
System Design
Multi-Tenancy System Low-Level Design
5 min read What is Multi-Tenancy? Multi-tenancy means a single application instance serves multiple customers (tenants), with each tenant’s data isolated from others. Read article
System Design
Notification Preferences System Low-Level Design
5 min read What are Notification Preferences? Notification preferences let users control which notifications they receive, via which channel (email, push, SMS, in-app), Read article
System Design
Social Login System Low-Level Design
6 min read What is Social Login? Social login (OAuth 2.0 / OpenID Connect) lets users authenticate with an existing identity provider (Google, Read article
System Design
Leaderboard System Low-Level Design
4 min read What is a Leaderboard System? A leaderboard ranks users or entities by a score, updated in real time. Use cases: Read article
System Design
Media Upload Service Low-Level Design
5 min read What is a Media Upload Service? A media upload service handles ingest, validation, processing, and storage of user-generated files: profile Read article