Analytics Data Pipeline System Design
10 min read Analytics Data Pipeline System Design Analytics pipelines move raw events from user actions into queryable dashboards. The core challenge: volume […] Read article
System Design
Algorithms, Coding Interview Questions, Data Structures, Heap
Advanced Heap Interview Patterns
10 min read Advanced Heap Interview Patterns Heaps appear in a surprising number of interview problems beyond the simple “find the Kth largest Read article
System Design
Recommendation System Low-Level Design
10 min read Recommendation System Low-Level Design Recommendation systems are one of the highest-ROI components in consumer products. They solve the discovery problem: Read article
Algorithms, Coding Interview Questions, Dynamic Programming, String Manipulation
Dynamic Programming on Strings Interview Patterns
9 min read Dynamic Programming on Strings Interview Patterns String DP problems share a common structure: a 2D table where one dimension indexes Read article
Algorithms, Coding Interview Questions, Depth-First Search, Graphs
Graph Traversal Interview Patterns
9 min read Graph Traversal Interview Patterns Graph problems appear in nearly every senior engineering interview. The key is recognizing which traversal fits Read article
System Design
Stock Exchange Order Matching System Design
8 min read Core Concepts A stock exchange at its core is a system that matches buyers and sellers. The central data structure Read article
Algorithms, Coding Interview Questions, Dynamic Programming, Tree
Dynamic Programming on Trees Interview Patterns
8 min read Core Pattern Tree DP follows a single structural pattern: post-order DFS. You recurse into children first, then compute the answer Read article
System Design
Content Delivery Network (CDN) System Design
8 min read What a CDN Does A Content Delivery Network serves content from geographically close edge nodes, dramatically reducing latency. A request Read article
System Design
Message Queue System Low-Level Design
10 min read Message queues like Kafka, RabbitMQ, and SQS show up in both system design and low-level design interviews. Understanding the internals Read article
Algorithms, Coding Interview Questions, Linked List
Linked List Interview Patterns
10 min read Linked list problems trip up candidates because pointer manipulation is easy to mess up under pressure. These patterns cover every Read article
Algorithms, Coding Interview Questions, Data Structures
Sorting Algorithm Interview Patterns
10 min read Sorting problems appear constantly in interviews – not just “implement merge sort” but as tools to simplify harder problems. Master Read article
System Design
Payment System Low-Level Design
9 min read Payment State Machine A payment must move through well-defined states. Never allow arbitrary transitions or skipped states. INITIATED -> PROCESSING Read article
Algorithms, Coding Interview Questions, Greedy
Greedy Algorithm Interview Patterns
8 min read When Greedy Works: The Exchange Argument Greedy algorithms make the locally optimal choice at each step. They are provably correct Read article
System Design
URL Shortener System Low-Level Design
7 min read Requirements Functional requirements for a URL shortener: Create a short URL from a long original URL Redirect users from the Read article
System Design
Distributed Cache System Low-Level Design
12 min read Caching is the single highest-leverage optimization in most systems. A well-designed cache can cut database load by 90% and reduce Read article