System Design Course
Hands-on
System Design Labs
Drag components, connect them, crank up traffic. Each lab pairs with a course chapter — read the lesson, then break things on purpose until scaling clicks.
Beginner
Horizontal Scaling Lab
Add app servers behind a load balancer, crank up IPL-level traffic, and watch CPU melt or survive.
Load balancingHorizontal scalingCapacity planning
15 minWhen One Server Isn't Enough
Beginner
Request Flow Lab
Build a path from client to database. Add cache and see hits vs misses in real time.
Request routingCachingClient-server flow
15 minWhen One Server Isn't Enough
Intermediate
Database Sharding Lab
Partition data across shards. See what happens when one tenant gets all the traffic.
ShardingPartition keysHot spots
20 minScaling the Data Layer
Intermediate
Consistency Lab
Toggle strong vs eventual consistency and watch replication packets chase each other.
CAP theoremReplicationRead-your-writes
20 minScaling the Data Layer
Finished a lab? Jump back to the course or try timed design challenges.