8 min read What Is a Configuration Management Service? A configuration management service stores application configuration (database connection strings, feature toggle values, service […] Read article
7 min read Stack and Queue Fundamentals A stack is LIFO (last-in, first-out): push adds to the top, pop removes from the top. Read article
7 min read The Three Pillars of Observability Observability is the ability to understand the internal state of a system from its external Read article
8 min read Why Distributed Locks Are Needed In a distributed system, multiple instances of a service may run concurrently. When these instances Read article
8 min read The Sliding Window Technique The sliding window technique optimizes brute-force O(n^2) or O(n^3) problems to O(n) by maintaining a window Read article
8 min read What Are Feature Flags? Feature flags (also called feature toggles or feature gates) decouple code deployment from feature release. A Read article
8 min read Why Content Moderation Is a Hard Systems Problem A platform with 500 million daily active users generates billions of pieces Read article
8 min read Heap Fundamentals A heap is a complete binary tree satisfying the heap property: in a min-heap, every parent is smaller Read article
8 min read What Makes Stock Exchanges Hard to Design A stock exchange is one of the most demanding distributed systems: it must Read article
8 min read Why Linked Lists Are Tested Linked lists appear in roughly 10% of coding interviews, mostly testing pointer manipulation, two-pointer techniques, Read article
8 min read What Is an API Gateway? An API gateway is the single entry point for all client requests to a microservices Read article
7 min read Analytics vs Transactional Systems OLTP (Online Transaction Processing) systems like PostgreSQL are optimized for short, frequent reads and writes to Read article
9 min read Why Binary Search Is Tested So Frequently Binary search appears in roughly 10-15% of FAANG coding interviews, both as a Read article
8 min read Problem Overview Design a hotel or short-term rental booking system like Airbnb or Booking.com. Users search for available properties in Read article
8 min read Why Recommendations Matter Netflix reports that 80% of content watched is discovered through recommendations. Spotify generates 30% of its streams Read article
