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
5 min read What is GDPR Right to Erasure? GDPR Article 17 gives EU users the “right to be forgotten” — they can Read article
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
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
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
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
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
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
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
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
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
6 min read Requirements Track stock levels across multiple warehouses for millions of SKUs Reserve inventory when an order is placed; deduct when Read article
7 min read What is Order Fulfillment? Order fulfillment covers the steps from a confirmed order to the item delivered to the customer: Read article
6 min read What is a Search Index? A search index enables fast full-text queries over large datasets. Without an index, searching 1 Read article
7 min read What Does a DNS Resolver Do? The Domain Name System (DNS) translates human-readable domain names (www.example.com) into IP addresses (93.184.216.34). Read article
