sys0Early access

Interactive System Design Platform

Learn system design
by doing it.

Design each system yourself, and see how it holds up under load - from one server to distributed systems.

Design your first system
See pricingSee the path

19 modules137 lessons18 labs~31 hours+ 15 system labs

Practice systems using interactive labs

Where to start

New to system design?

  1. What is system design?
  2. Start with a simple system
  3. Caching
  4. When one server isn't enough
  5. When one database isn't enough

Follow the path

19 modules, from one server to distributed systems, in the order a growing app needs them. Read each idea, then build it.

Start the path

Know the basics?

Practice in the labs

Pick one of 15 apps you use every day, design it from a blank page, then put it under load and fix whatever breaks.

See the labs

Structured lessons, from zero to distributed systems

Every module builds on the one before, in the order a growing app needs it.

Foundations

Part 1 · 10 modules · 62 lessons

  1. 1What is system design?
  2. 2Start with a simple system
  3. 3Caching
  4. 4When one server isn't enough
  5. 5When one database isn't enough
  6. 6Live updates
  7. 7Background jobs
  8. 8Rate limiting
  9. 9Growing big
  10. 10Putting it together

Distributed systems

Part 2 · 8 modules · 56 lessons

  1. 11Microservices
  2. 12Problems in distributed systems
  3. 13Replication in depth
  4. 14Partitioning in depth
  5. 15Messaging: Kafka and pub/sub
  6. 16Transactions across services
  7. 17Events and streams
  8. 18Availability and going global

Under the hood

Part 3 · 1 module · 19 lessons

  1. 19Classic algorithms in action
See every lesson on the path
Rakesh K

What building these systems taught me

I've spent years building and running backends, and teaching what I learned on Coder's Gyan. sys0 is the path I wish I'd had: the concepts in the order you need them, and a place to learn and practice each one.

Rakesh K

Ex-Principal Software EngineerFounder at Coder's Gyan

Join as a founding member while it's being built

The first 500 members pay 50% less, for as long as they stay. You get every lesson that's ready today, and every one we add.

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Founding price ends 20 Oct 2026, or sooner if 500 members join first

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Common questions

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Founding price ends 20 Oct 2026