System Design Cheat Sheet: Concepts Every Developer Should Know
The practical reference guide for building scalable, reliable systems
Search across 267 posts, 23 explainers, and 87 topics
How OAuth 2.0 Works: Authorization Flows, Tokens, and PKCE
How modern apps access your data without seeing your password
How Google Docs Works Behind the Scenes
How Google Docs syncs edits from millions of users typing at the same time without losing a single character
Skip List Data Structure: A Faster Alternative to Trees
How Redis, LevelDB, and modern databases achieve O(log n) search without complex tree balancing
Getting the Most Out of AI Coding Assistants
Practical lessons from developers who actually use GitHub Copilot, Cursor, and other AI tools daily
How Meta Handles Millions of Serverless Function Calls Per Second
Inside XFaaS: The platform processing trillions of function calls daily across 100,000+ servers
X Algorithm Explained: How the Open Source Recommendation System Works
A detailed explanation of X's open source algorithm from the GitHub repository — how the recommendation system works, from candidate sourcing to Grok-based ranking
How Does an LLM Generate Text?
What actually happens inside GPT, Claude, and Llama when you hit enter
Complete Guide to Graph Data Structure: BFS, DFS, Adjacency List vs Matrix
Graph fundamentals with BFS and DFS time complexity explained: O(V+E) with adjacency list, O(V²) with adjacency matrix, plus 20+ algorithms with code.
B-Tree Data Structure: How Databases Search Billions of Records
How databases and file systems store billions of records and find any one of them in milliseconds
How HyperLogLog Works
Count billions of unique items using only 12 KB of memory
How Count-Min Sketch Works
Track frequencies in streaming data without storing everything
How Bloom Filters Work
How databases, browsers, and caches check if something exists without storing everything
Local LLM Speed: RTX 3060, Qwen2 & Llama Benchmark Results
Real benchmarks for 14B and 8B models on RTX 3060 12GB, RTX 4070, RTX 4090, and Apple Silicon with llama.cpp and Ollama
How Snowflake IDs Work
How Twitter, Discord, and Instagram generate billions of unique IDs without a central database
How to Run LLMs on Your Own Computer
How to run Llama, Mistral, and other open source models on your own hardware
How Database Indexing Works
Everything you need to know about indexes, from B-trees to query optimization
Universal Commerce Protocol (UCP) Explained
Google's new open standard for AI-driven shopping and how to integrate it
