Low Level Design: Priority Queue Service
4 min read What Is a Priority Queue Service? A Priority Queue Service extends a standard job queue by processing tasks in priority […] Read article
System Design
← Tech Interview
System Design
Learn to design scalable, reliable systems that handle millions of users. System design interviews test your ability to architect real-world applications, considering tradeoffs, scalability, and best practices.
Core Topics:
Scalability: Load balancing, horizontal vs vertical scaling
Storage: Databases (SQL vs NoSQL), caching (Redis, Memcached)
Reliability: Replication, failover, disaster recovery
Performance: CDNs, caching strategies, database indexing
Common Design Questions:
Design URL shortener (bit.ly)
Design rate limiter
Design Twitter/Instagram feed
Design messaging system (WhatsApp)
Design file storage (Dropbox)
Interview Level: Senior engineers (L5+) at FAANG companies. Requires 3-5+ years experience to tackle effectively.
Preparation: Study system design patterns, understand distributed systems fundamentals, and practice mock interviews.
System Design
Low Level Design: Fan-Out Service
5 min read What Is a Fan-Out Service? A Fan-Out Service takes a single event produced by one source and delivers it to Read article
System Design
Low Level Design: Search Index Builder
4 min read What Is a Search Index Builder? A Search Index Builder is the offline pipeline responsible for transforming raw document corpora Read article
System Design
Low Level Design: Web Crawl Scheduler
4 min read What Is a Web Crawl Scheduler? A Web Crawl Scheduler manages the frontier of URLs to be fetched, decides the Read article
System Design
Low Level Design: Web Scraper Service
5 min read What Is a Web Scraper Service? A Web Scraper Service is the component responsible for fetching raw HTML from target Read article
System Design
Low Level Design: Wide-Column Store
6 min read What Is a Wide-Column Store? A wide-column store (also called a column-family store) organizes data in tables where rows can Read article
System Design
Low Level Design: QR Code Generator Service
5 min read What Is a QR Code Generator Service? A QR Code Generator Service accepts arbitrary data (URLs, vCards, plain text) and Read article
System Design
Low Level Design: Link Analytics Service
5 min read What Is a Link Analytics Service? A Link Analytics Service tracks every interaction with a shortened URL or QR code Read article
System Design
Low Level Design: Ad Targeting Service
4 min read What Is an Ad Targeting Service? An Ad Targeting Service is responsible for selecting the most relevant advertisements to show Read article
System Design
Low Level Design: Ad Auction System
4 min read What Is an Ad Auction System? An Ad Auction System determines which advertiser wins a given ad slot and how Read article
System Design
Low Level Design: Ad Delivery Service
5 min read What Is an Ad Delivery Service? The Ad Delivery Service is the final stage in the ad pipeline. Once the Read article
System Design
Low Level Design: Trust and Safety Platform
5 min read What Is a Trust and Safety Platform? A Trust and Safety (T&S) platform is the umbrella system that governs user Read article
System Design
Low Level Design: Real-Time Messaging Service
4 min read What Is a Real-Time Messaging Service? A real-time messaging service is the transport layer that moves data from one endpoint Read article
System Design
Low Level Design: Message Delivery Receipts Service
5 min read What Is a Message Delivery Receipts Service? A message delivery receipts service tracks the lifecycle of every message from send Read article
System Design
Low Level Design: Usage Metering Service
5 min read What Is a Usage Metering Service? A Usage Metering Service measures how much of a resource a customer consumes, aggregates Read article