System Design AI

Guided practice

Start with a template. Work through each step. Ask Coach when you need a second opinion.

Designs with worked examples 3

Ordered by design number

Company tags are community-reported. Counts on cards show how many people reported that design.

DynamoDBClear filters

45. Design a Job Scheduler
Run 10,000 jobs a second within two seconds of their time, at least once, with retries, fairness between tenants and exactly-once effects.
ClassicMedium
Queues Databases AWS
+5
Cron DynamoDB Idempotency Scheduling Amazon SQS
Worked design
Practice
67. Design for Write Scale: A Million Writes a Second
A live TV vote at a million writes a second: spread by key, buffer in Kafka, aggregate the hot counter in two stages, shed what can wait.
ClassicMedium
Sharding Databases Streaming
+6
Distributed systems AWS DynamoDB Flink Kafka Scaling writes
Worked design
Practice
100. Design a Distributed File System
Billions of files, hundreds of petabytes, one strongly consistent tree: a namespace partitioned by directory, chunk servers, replication, repair, erasure coding. One-hour boards for junior, senior and staff, with the theory behind them.
ClassicMedium
Databases Distributed systems AWS
+6
DynamoDB Erasure coding File system Infrastructure Replication Storage
Worked design
Practice

Self-paced by default. Your answers and canvas stay private. AI feedback runs only when you ask for it.