Consistent Hashing
Change server membership and compare key movement with modulo and virtual-node rings.
Explore Consistent Hashing SYSTEM DESIGN PLAYGROUND
Understand the system.
Then change the conditions.
Learn how production systems work by running them. Follow a request, test a routing decision, and see exactly where it breaks.
Enter the Load Balancer LabCLIENTSROUTE · OBSERVE · REPLAY
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Every decision leaves a trace.0% published labs complete36 interactive lessons9 categories on the mapLocal progress, no account needed
Interactive labs
A complete experiment, from first request to failure recovery.
INTERACTIVE · AVAILABLE NOW
Launch lab Load Balancer Lab
Round Robin · Weighted routing · Least Connections · L4/L7 · Health checks
CAP Theorem
Partition replicas, compare consistency with availability, and reconcile divergent writes.
Explore CAP TheoremOSI Model
Follow encapsulation through seven conceptual network layers and locate injected faults.
Explore OSI ModelAPI Gateway
Follow authentication, quotas, service routing, timeouts and an open circuit.
Explore API GatewayRate Limiting
Compare fixed windows, sliding logs and token buckets against a boundary burst.
Explore Rate LimitingAPI Design
Design safe retries, validate requests, prevent lost updates and compare pagination strategies.
Explore API DesignACID Transactions
Interrupt a transfer and inspect atomicity, isolation, constraints and durable recovery.
Explore ACID TransactionsCaching Strategies
Inspect cache hits, stale reads, write policies and a crash before a buffered write commits.
Explore Caching StrategiesPub/Sub
Fan out events, filter subscriptions, and recover an offline subscriber without duplicate effects.
Explore Pub/SubMessage Queues
Dispatch jobs, crash consumers, retry deliveries and prevent duplicate business effects.
Explore Message QueuesCourse map
Explore the path ahead. Only published labs count toward completion.
Core Concepts
0 / 2 published complete- ScalabilityRoadmap
- AvailabilityRoadmap
- ReliabilityRoadmap
- Single Point of Failure (SPOF)Roadmap
- Latency vs Throughput vs BandwidthRoadmap
- Consistent Hashing
- CAP Theorem
- FailoverRoadmap
- Fault ToleranceRoadmap
Networking Fundamentals
0 / 2 published complete- OSI Model
- IP AddressesRoadmap
- DNSRoadmap
- Proxy vs Reverse ProxyRoadmap
- HTTP / HTTPSRoadmap
- TCP vs UDPRoadmap
- Load Balancing
- ChecksumsRoadmap
API Fundamentals
0 / 3 published complete- APIsRoadmap
- API Gateway
- REST vs GraphQLRoadmap
- WebSocketsRoadmap
- WebhooksRoadmap
- IdempotencyRoadmap
- Rate Limiting
- API Design
Database Fundamentals
0 / 1 published complete- ACID Transactions
- SQL vs NoSQLRoadmap
- Database IndexesRoadmap
- Database ShardingRoadmap
- Data ReplicationRoadmap
- Database ScalingRoadmap
- Database TypesRoadmap
- Bloom FiltersRoadmap
- Database ArchitecturesRoadmap
Caching Fundamentals
0 / 1 published complete- Caching 101Roadmap
- Caching Strategies
- Cache Eviction PoliciesRoadmap
- Distributed CachingRoadmap
- CDNRoadmap
Asynchronous Communication
0 / 2 published complete- Pub/Sub
- Message Queues
- Change Data CaptureRoadmap
Distributed Systems & Microservices
Planned- HeartbeatsRoadmap
- Service DiscoveryRoadmap
- Consensus AlgorithmsRoadmap
- Distributed LockingRoadmap
- Gossip ProtocolRoadmap
- Circuit BreakerRoadmap
- Disaster RecoveryRoadmap
- Distributed TracingRoadmap
Architectural Patterns
Planned- Client-Server ArchitectureRoadmap
- Microservices ArchitectureRoadmap
- Serverless ArchitectureRoadmap
- Event-Driven ArchitectureRoadmap
- Peer-to-Peer ArchitectureRoadmap
System Design Tradeoffs
Planned- Vertical vs Horizontal ScalingRoadmap
- Concurrency vs ParallelismRoadmap
- Long Polling vs WebSocketsRoadmap
- Batch vs Stream ProcessingRoadmap
- Stateful vs StatelessRoadmap
- Strong vs Eventual ConsistencyRoadmap
- Read-Through vs Write-Through CacheRoadmap
- Push vs PullRoadmap
- REST vs RPCRoadmap
- Synchronous vs Asynchronous CommunicationRoadmap
- Latency vs ThroughputRoadmap