System Design Interview Mastery is a guided sequence designed to build your understanding step by step.

System Design Interview Mastery

Master the laws of distributed systems. Learn how to navigate the trade-offs  between Consistency, Availability, and Partition Tolerance.

System Design Module 8: CAP Theorem & Consistency Models

Master the most critical decision in system design. Learn the technical trade-offs  between relational databases and various NoSQL models.

System Design Module 6: Database Design (SQL vs NoSQL)

Learn the fundamental concepts of system design. Master the transition from  monoliths to distributed systems and understand the core architectural goals.

System Design Module 1: Introduction to Distributed Systems

Learn the foundational strategies for handling growth. Master vertical scaling,  horizontal scaling, and the transition to a stateless architecture.

System Design Module 3: Scalability Basics (Vertical vs Horizontal)

A quick-reference guide for all system design components, numbers you should know, and trade-off patterns.

Bonus: The Ultimate System Design Cheatsheet

The ultimate guide to mastering distributed systems. From scalability basics to  advanced case studies like Uber and Stripe. 6-8 week learning path.

Complete System Design Interview Preparation Roadmap

Learn how to design a highly available URL shortener service that can handle  billions of redirects per month.

Case Study: Design a URL Shortener (Bitly)

Learn how to design a scalable news feed system that handles billions of posts  and real-time delivery to millions of followers.

Case Study: Design a Social Media Feed (Instagram/Twitter)

Learn how to structure your 45-minute system design interview.  Master the PEDAL framework to cover everything from requirements to deep dives.

System Design Module 2: The Interview Framework (PEDAL)

Learn the difference between logical table partitioning and physical database sharding. Which one do you need?

Database Sharding Part 2: Partitioning vs. Sharding

How does a message queue handle millions of events per second with 100% durability? A technical deep dive into Log Segments, Consumer Groups, and Zero-Copy.

System Design: Designing a Distributed Message Queue (Kafka Architecture)

Learn the fundamentals of load balancing, how it works, and the core algorithms used in modern distributed systems.

What is Load Balancing? A Simple Guide for Backend Engineers

Learn how to design robust, versioned, and protected APIs. Master the  fundamentals of REST, gRPC, and Rate Limiting strategies.

System Design Module 10: API Design & Rate Limiting

How to build a distributed BLOB storage system capable of storing exabytes of data. A deep dive into erasure coding, metadata management, and consistent hashing.

System Design: Designing a Distributed BLOB Store (like S3/GCS)

How does WhatsApp handle billions of messages per day? A technical deep dive into WebSockets, XMPP, Message Persistence, and Presence Management.

System Design: Designing WhatsApp (Real-time Messaging)

A practical guide to cache invalidation in production systems: TTLs, cache-aside, write-through, versioned keys, event-driven eviction, stampede prevention, and stale-read tradeoffs.

Cache Invalidation Patterns: TTL, Write-Through, Cache-Aside, and Event-Driven Eviction

How does YouTube handle millions of video uploads and billions of views? A technical deep dive into Video Transcoding, CDNs, Adaptive Bitrate Streaming, and storage optimization.

Project Case Study: Designing YouTube (Video Streaming at Global Scale)

A contrarian but technically grounded case for starting with a well-structured monolith. Distributed transaction costs, network latency math, observability overhead, and when to actually break services apart.

Microservices Are Overrated for Most Startups

A technical deep dive into designing a ride-sharing service like Uber. Learn about Geospatial indexing with Quadtrees, S2 cells, and real-time supply-demand matching.

System Design: Designing Uber (Ride-sharing at Scale)

End-to-end observability implementation: distributed tracing with OpenTelemetry, metrics with Prometheus, structured logging with Loki, and the dashboards and alerts that actually help during incidents.

Building Production Observability with OpenTelemetry and Grafana Stack

Learn how to design a mission-critical payment system that guarantees  idempotency, consistency, and absolute precision.

Case Study: Design a Payment System (Stripe/UPI)

Design a production authorization service with RBAC, ABAC, policy evaluation, relationship-based permissions, caching, audit logs, consistency tradeoffs, and safe rollout patterns.

System Design: Building an Authorization Service

How to design systems that only fail for 5 minutes a year. Beyond simple redundancy: Cellular architecture, fault domains, and grey-failure detection.

Designing for 99.999% Availability: The Five Nines Blueprint

Design a scalable notification system that delivers push, email, SMS, and in-app notifications reliably. Covers fan-out strategies, priority queues, delivery guarantees, and user preference management.

System Design: Building a Notification System for 100 Million Users

How does Elasticsearch search through billions of documents in milliseconds? A technical deep dive into Inverted Indexes, Sharding, and Segment Merging.

System Design: Designing a Distributed Search Engine (Elasticsearch)

How to prevent service abuse at scale. A deep dive into Rate Limiting algorithms (Token Bucket, Sliding Window), Redis Lua scripting, and capacity math.

System Design: Designing a Global Distributed Rate Limiter

Design a production distributed cache with sharding, replication, eviction, invalidation, hot-key protection, consistency trade-offs, write patterns, and failure handling.

System Design: Building a Distributed Cache

How do you ingest and query terabytes of logs every day? A deep dive into the ELK stack architecture, Buffering with Kafka, and Sharding for Search.

System Design: Designing a Distributed Logging System (TB/Day Scale)

Design a production API gateway platform with routing, authentication, authorization, rate limiting, request shaping, canary releases, retries, timeouts, config rollout, observability, and failure isolation.

System Design: Building an API Gateway Platform

Master the architecture of distributed file storage. Learn how Google Drive and Dropbox handle multi-GB files using Chunking, Deduplication, and Delta Sync.

System Design: Designing Google Drive (Distributed File Storage)

How does TikTok keep you scrolling? A deep dive into Recommendation Systems, Collaborative Filtering, Content-based Filtering, and Real-time Feature Stores.

System Design: Designing a Real-time Recommendation Engine (TikTok / Netflix)

How to visualize millions of events per second on a dashboard. Deep dive into stream aggregation, TSDBs, and WebSocket push architectures.

System Design: Designing a Real-Time Analytics Dashboard

Design a production fraud detection platform with real-time scoring, rules, ML models, feature stores, case management, feedback loops, and safe decision workflows for payments and account abuse.

System Design: Building a Fraud Detection Platform

Designing SaaS backends? Learn how to implement multi-tenancy in NoSQL. Explore Database-per-tenant, Schema-per-tenant, and Shared-schema (Partitioning) strategies.

Multi-Tenancy in NoSQL: Data Isolation Strategies for SaaS

Design a production feature flag platform: flag schemas, targeting rules, percentage rollouts, local SDK evaluation, streaming updates, audit logs, kill switches, experiments, consistency tradeoffs, and flag lifecycle management.

System Design Interview Mastery

Production-Ready

Interactive Progress

Certification

Course Curriculum

4. Distributed Theory

3. Storage & Data

1. Core Fundamentals

2. Scalability & Traffic

Bonus Content

0. The Master Roadmap

Case Studies (Master-tier)

Ready to Master this Track?