System Design Interview: Design a Web Crawler and Search Indexer
5 min read What Is a Web Crawler and Search Indexer? A web crawler systematically downloads web pages. A search indexer processes those […] Read article
System Design
System Design
System Design Interview: Design a Multi-Region Database System
6 min read Why Multi-Region Databases? A single-region database has two critical weaknesses: latency (users in Europe querying a US database experience 150ms+ Read article
Algorithms
Greedy Algorithm Interview Patterns: Intervals, Jump Game, Task Scheduler
6 min read What Are Greedy Algorithms? A greedy algorithm makes the locally optimal choice at each step, never backtracking, hoping that local Read article
System Design
System Design Interview: Design a Streaming Data Pipeline (Kafka + Flink)
6 min read What Is a Streaming Data Pipeline? A streaming data pipeline continuously ingests, processes, and routes events in real time — Read article
System Design
System Design Interview: Design a Geospatial Service (Nearby Search)
5 min read System Design Interview: Design a Geospatial Service (Nearby Search) Geospatial services power “find restaurants near me,” Uber driver lookup, and Read article
System Design
System Design Interview: Design a Cryptocurrency Exchange (Coinbase / Binance)
5 min read System Design Interview: Design a Cryptocurrency Exchange (Coinbase / Binance) A cryptocurrency exchange enables users to buy, sell, and trade Read article
System Design
System Design Interview: Design an E-Commerce Platform (Amazon / Shopify)
5 min read System Design Interview: Design an E-Commerce Platform (Amazon / Shopify) An e-commerce platform handles product discovery, inventory management, order processing, Read article
Algorithms
Recursion and Memoization Interview Patterns: LCS, Edit Distance, Word Break
5 min read Recursion and Memoization Interview Patterns Memoization transforms exponential recursive solutions into polynomial ones by caching subproblem results. In Python, @lru_cache Read article
System Design
System Design Interview: Distributed Transactions, 2PC, and the Saga Pattern
5 min read System Design Interview: Distributed Transactions, 2PC, and the Saga Pattern When a business operation spans multiple microservices or databases, maintaining Read article
Algorithms
Interval DP and Advanced Dynamic Programming: Burst Balloons, State Machine, Tree DP
6 min read Interval DP and Advanced Dynamic Programming Patterns Interval DP solves optimization problems over contiguous subarrays or subsequences. The core idea: Read article
System Design
System Design Interview: Design a Real-Time Collaborative Editor (Google Docs)
5 min read System Design Interview: Design a Real-Time Collaborative Editor (Google Docs) A collaborative editor allows multiple users to edit the same Read article
System Design
System Design Interview: Design a Feature Flag System (LaunchDarkly)
5 min read System Design Interview: Design a Feature Flag System Feature flags (feature toggles) enable teams to deploy code to production without Read article
Algorithms
Two Pointers and Sliding Window Interview Patterns
6 min read Two Pointers and Sliding Window Interview Patterns Two pointers and sliding window are techniques that turn O(n²) brute-force solutions into Read article
System Design
System Design Interview: Design a Metrics and Monitoring System (Datadog/Prometheus)
5 min read System Design Interview: Design a Metrics and Monitoring System Every large tech company runs a custom metrics and monitoring platform. Read article
Algorithms
Graph Algorithm Interview Patterns: BFS, DFS, Dijkstra, Topological Sort
6 min read Graph Algorithm Interview Patterns: BFS, DFS, Dijkstra, Topological Sort Graph problems are a staple of coding interviews. The key is Read article