Part one
Competitive Programming
Arrays to DP, graphs, and bit tricks — patterns that unlock most coding interview problems.
Coding · System design · AI · in one place
Interview Prep
Three parts in one book. Competitive programming patterns in plain English with working Python and Java. System design from first principles through WhatsApp, Amazon, and YouTube. And a hands-on tour of modern AI — RAG, agents, memory, MCP, and skills. Plus Interview Labs with questions actually asked in hiring loops.
One book. Three tracks.
Real HTML chapters — selectable text, syntax-styled code, and diagrams only where a picture helps.
Part two
System Design
Building blocks plus walkthroughs for URL shorteners, chat, feeds, storage, video, and ride hailing.
Part three
AI Engineering
A deep, story-driven path: how LLMs work, prompting, RAG, memory, agents, MCP, skills, and designing a full assistant.
Interview Labs
Real prompts from FAANG and product-company loops — expandable solutions, follow-ups, and talking tracks.
Coding
20 coding questions · deep solutions
FAANG-frequency problems from Two Sum to Alien Dictionary — step-by-step with diagrams and code.
System design
18 design questions · deep solutions
URL shortener through Dropbox, payments, crawlers, and Kafka — whiteboard tracks with diagrams.
AI
17 AI questions · deep solutions
RAG, agents, inference serving, copilots, feature stores, and injection defenses — with failure modes.
Contents
Jump into any chapter. Each one is a normal web page you can search, copy, and skim.
Diagrams from the book
Architecture sketches redrawn as clean SVGs for each topic — not photographed PDF pages.