Real-world systems
Design walkthroughs and real architectures, with the technologies they use.
a key-value store on SQL
A design walkthrough you can build from.
a URL shortener, one machine
A design walkthrough you can build from.
Instagram's first architecture
A company case: what they built, and what it cost them.
Stripe's idempotency keys
A company case: what they built, and what it cost them.
rate limiting and abuse prevention
A design walkthrough you can build from.
a URL shortener at scale
A design walkthrough you can build from.
a product listing
A design walkthrough you can build from.
how Discord stores trillions of messages
A company case: what they built, and what it cost them.
Amazon Dynamo, the paper
A company case: what they built, and what it cost them.
a collaborative editor
A design walkthrough you can build from.
an object store (S3)
A design walkthrough you can build from.
a Kafka-style log
A design walkthrough you can build from.
a notification system
A design walkthrough you can build from.
a ticket booking system
A design walkthrough you can build from.
a payment system
A design walkthrough you can build from.
autocomplete
A design walkthrough you can build from.
did-you-mean and spell correction
A design walkthrough you can build from.
related searches
A design walkthrough you can build from.
recent searches
A design walkthrough you can build from.
a search service
A design walkthrough you can build from.
live reactions at high throughput
A design walkthrough you can build from.
a recommendation system
A design walkthrough you can build from.
live commentary
A design walkthrough you can build from.
chat and messaging
A design walkthrough you can build from.
a newly-unread indicator
A design walkthrough you can build from.
photo tagging coordinates
A design walkthrough you can build from.
a social feed
A design walkthrough you can build from.
nearby search
A design walkthrough you can build from.
ride matching
A design walkthrough you can build from.
a video platform
A design walkthrough you can build from.
a file sync service
A design walkthrough you can build from.
observability and SLOs
A design walkthrough you can build from.
a database migration
A design walkthrough you can build from.
GitLab’s database incident
A company case: what they built, and what it cost them.
a photo-sharing interview
A design walkthrough you can build from.