Your Progress
Track your journey through all modules
Learn Like an Engineer, Not a Student
Most resources throw buzzwords at you. This platform forces you to think through tradeoffs, failures, and real engineering decisions.
Why It Exists
Every technology has a origin story — a problem it solved. We start there.
What Breaks
Understanding failure modes is more valuable than understanding happy paths.
Tradeoffs First
There are no best solutions — only informed tradeoffs. We teach you to reason about them.
Real Scale
Every concept is shown at 1x, 100x, and 1M+ users. Behaviour changes at scale.
Interview-Ready
Not just knowledge — we teach you how to communicate architectural decisions under pressure.
Interactive Simulations
Watch caches warm, queues backpressure, and consensus fail — live in your browser.
All 16 Modules
Follow the path in order, or jump directly to what you need.
Foundations of System Design
CAP theorem, ACID vs BASE, horizontal/vertical scaling, load balancing, caching, rate limiting, circuit breakers, and 30+ core concepts.
Module 02Networking Fundamentals
HTTP/1.1 vs HTTP/2 vs HTTP/3, TCP vs UDP, TLS, DNS resolution, WebSockets, REST, GraphQL, gRPC, CDN request flows.
Module 03Databases Deep Dive
SQL internals, B+ trees, indexing, isolation levels, NoSQL types, Cassandra, Redis, MongoDB, DynamoDB, sharding, and replication.
Module 04Caching Systems
Cache-aside, write-through, write-back, TTL, Redis internals, eviction policies, cache stampede, consistent hashing, hot keys.
Module 05Message Queues & Streaming
Kafka internals, RabbitMQ, consumer groups, ordering guarantees, exactly-once semantics, backpressure, dead letter queues.
Module 06Distributed Systems
Raft consensus, Paxos, vector clocks, gossip protocols, distributed transactions, sagas, split-brain, quorum systems. Goes very deep.
Module 07Scalability Patterns
CQRS, event sourcing, geo-distribution, active-active, bulkheads, service mesh, sidecar pattern, read/write splitting.
Module 08DevOps & Infrastructure
Docker, Kubernetes, CI/CD, Terraform, monitoring, distributed tracing, observability, autoscaling, service mesh basics.
Module 09Security for System Design
OAuth, JWT, zero trust, DDoS protection, TLS internals, secrets management, rate limiting, CSRF, XSS, SQL injection.
Module 10Real System Design Interviews
Full designs for YouTube, WhatsApp, Uber, Instagram, Netflix, Twitter, Google Drive, Spotify, Discord, URL shortener, and 10+ more.
Module 11Interactive Visualizations
Live simulations of caching, sharding, replication, consensus, load balancing, queue processing, and failover. Click to break things.
Module 12Learning & Revision System
Progress tracking, quizzes, flashcards, revision sheets, architecture cheat sheets, interview checkpoints, and learning paths.
Module 13Interview Simulator
35-minute timed mock interviews with whiteboard canvas, model solutions, and self-scoring across 5 dimensions. Practice under real pressure.
Module 14Real Production Incidents
Deep dives into catastrophic failures: Facebook BGP outage, Netflix Christmas crisis, GitHub split-brain, Discord Cassandra migration.
Module 15Tech Comparison Tables
Interactive side-by-side comparisons of databases, caches, queues, protocols, consistency models, and deployment strategies.
Module 16Global Search
Full-text search across all 16 modules and 200+ topics. Find any concept, pattern, or technology instantly with module filters.
Beginner to Interview-Ready
Estimated 6–8 weeks for full mastery. Each step builds on the last.
Week 1–2 · Foundations
Master Foundations + Networking. These underpin everything else. Don't skip them.
Week 2–3 · Data Layer
Deep dive Databases + Caching. 80% of system design problems are data layer problems.
Week 3–4 · Scale
Message Queues + Distributed Systems. This is where junior and senior engineers diverge.
Week 5 · Production
Scalability Patterns + DevOps + Security. Build complete production-thinking.
Week 6–8 · Interview Practice
Work through all 20 system designs. Time yourself. Review tradeoffs. Use the visualiser.