System Design Interview: Design a Typeahead / Search Suggestion System
What Is a Typeahead / Search Suggestion System? A typeahead (also called autocomplete or search suggestion) system predicts what a […]
System Design
Algorithms
Advanced Dynamic Programming Patterns: State Machine, Interval DP, Tree DP, Bitmask
Advanced Dynamic Programming Patterns Beyond the foundational DP patterns (Fibonacci, 0/1 knapsack, LCS), advanced interviews test state machine DP, interval
System Design
System Design Interview: Design an Ad Click Aggregation System (Google/Meta Ads)
What Is an Ad Click Aggregation System? Ad platforms (Google Ads, Meta Ads, Amazon Advertising) must aggregate billions of ad
System Design
System Design Interview: Design a Distributed Message Queue (SQS / RabbitMQ)
What Is a Distributed Message Queue? A message queue decouples producers (services that generate work) from consumers (services that process
Algorithms
String Algorithm Interview Patterns: Sliding Window, Palindromes, Anagrams, Rolling Hash
String Algorithm Patterns in Interviews String problems are ubiquitous in coding interviews. Most string challenges reduce to a small set
System Design
System Design Interview: Design a Live Sports Score System
What Is a Live Sports Score System? A live sports score system delivers real-time score updates to millions of concurrent
System Design
System Design Interview: Design a Cloud File Storage System (Dropbox/Google Drive)
What Is a Cloud File Storage System? A cloud file storage system lets users upload, sync, and share files across
System Design
System Design Interview: Design a Web Crawler and Search Indexer
What Is a Web Crawler and Search Indexer? A web crawler systematically downloads web pages. A search indexer processes those
Algorithms
Union-Find (Disjoint Set Union) Interview Patterns: Connected Components, Kruskal’s MST
What Is Union-Find? Union-Find (Disjoint Set Union, DSU) is a data structure that tracks a collection of elements partitioned into
System Design
System Design Interview: Design an Online Auction System (eBay)
What Is an Online Auction System? An online auction system allows sellers to list items and buyers to place competitive
System Design
System Design Interview: Design a Multi-Region Database System
Why Multi-Region Databases? A single-region database has two critical weaknesses: latency (users in Europe querying a US database experience 150ms+
Algorithms
Greedy Algorithm Interview Patterns: Intervals, Jump Game, Task Scheduler
What Are Greedy Algorithms? A greedy algorithm makes the locally optimal choice at each step, never backtracking, hoping that local
System Design
System Design Interview: Design a Streaming Data Pipeline (Kafka + Flink)
What Is a Streaming Data Pipeline? A streaming data pipeline continuously ingests, processes, and routes events in real time —
System Design
System Design Interview: Design a Geospatial Service (Nearby Search)
System Design Interview: Design a Geospatial Service (Nearby Search) Geospatial services power “find restaurants near me,” Uber driver lookup, and
System Design
System Design Interview: Design a Cryptocurrency Exchange (Coinbase / Binance)
System Design Interview: Design a Cryptocurrency Exchange (Coinbase / Binance) A cryptocurrency exchange enables users to buy, sell, and trade