28 chapters · 2 parts
Grokking the System Design Interview
The classic course: a step-by-step interview framework, 16 worked designs from TinyURL to Ticketmaster, and the building blocks every design uses.
System design
Frameworks, building blocks and worked designs for the classic round.
14 chapters
System Design Case Studies
Original worked designs for interview prompts: payments, job scheduling, collaborative editing, leaderboards, a matching engine, ad click aggregation, metrics, object storage, hotel booking, a distributed cache, email, global rate limiting and real-time pedestrian intent.
101 chapters · 9 parts
Grokking the Advanced System Design Interview
How real distributed systems work: Dynamo, Cassandra, Kafka, Chubby, GFS, HDFS and BigTable, followed by 20 reusable system design patterns.
9 chapters
System Design Interview Notes
Original interview-focused notes on estimation, reusable distributed-system building blocks, and common design follow-ups.
18 chapters
System Design Interview Notes
Junfan Zhu's condensed review notes of the classic course, for a fast refresher before an interview.
6 chapters
CTCI System Design Notes
Original notes inspired by the system design chapter of Cracking the Coding Interview, focused on turning an open-ended prompt into a scoped, scalable, and defensible design. This is a private study aid, not a reproduction of the book.
10 chapters
Data Systems Notes
Original notes on reliable data-intensive applications, storage engines, replication, partitioning, and data processing.
7 chapters
Domain and Software Design Notes
Original notes on managing software complexity with simpler designs, useful domain models, and explicit boundaries.
10 chapters
Linux and Operations Notes
Original operational notes covering the shell, processes, filesystems, networking, services, observability, and safe administration.
Object-oriented and AI design
Low-level design exercises, ML and LLM systems, and the AI-assisted coding round.
13 chapters
Low-Level Design Practice
Work through parking lots, elevators, vending machines, schedulers, expense splitting, ticket booking, chess, libraries, rate limiters, pub/sub, ATMs and room booking with invariants, failure cases, and tests.
9 chapters
AI System Design Practice
Design retrieval and support assistants, recommendation feeds, feature stores, LLM inference, moderation and fraud detection, and reason about evaluation, freshness, latency and cost.
7 chapters
AI-Assisted Coding Interviews
The newer round where you may use an AI assistant: how it is graded, a 60-minute workflow, reading unfamiliar code, verifying generated code, and two worked exercises with a rubric.
Fundamentals and craft
CS fundamentals, frontend interviews, testing, debugging and code review.
6 chapters
CS Fundamentals Quick Reference
Operating systems, networking, databases, concurrency primitives, complexity tables and latency numbers, each with questions to answer aloud.
5 chapters
Frontend Interviews
JavaScript fundamentals, the event loop, browser rendering and performance, accessible UI components, and frontend system design.
4 chapters
Testing, Debugging, and Code Review
Practice independent test oracles, debug binary search, review a concurrency defect, and rehearse a complete coding interview.
Behavioral and career
Stories, leadership questions, resumes, the job search and offers.
8 chapters
Behavioral and Leadership Interviews
Build a factual story bank, prepare introductions and company-specific answers, practice conflict and failure discussions, and rehearse senior technical decisions with review rubrics.
4 chapters
Resume, Job Search and Offers
Write a resume that earns interviews, navigate the hiring process, prepare on a schedule, and evaluate and negotiate offers.