System design
Learning paths
Topics
Roadmaps
Games
Search articles, topics...
⌘K
Library
Topics
India scale
Tatkal bursts, UPI volumes and a billion cricket fans: the traffic shapes that teach scale.
Path
System design
Level
Foundation
Core
Senior
Staff
Design questions only
Patterns
Claim with an expiry
Fan out on write or on read
Admit at the door
Safe retries
Number every change
Serve from the edge
One owner per key
The answer that never came
Narrow
Reliability
1
Caching
1
Transactions and locking
2
Concurrency
1
Real-time
1
Rate limiting and overload
1
Payments
1
3 pages
Design a UPI style payment rail
System design · Staff · 37 min
Payments
Transactions and locking
Reliability
Design IRCTC tatkal booking
System design · Senior · 37 min
Transactions and locking
Concurrency
Rate limiting and overload
Design live cricket score fan out
System design · Senior · 34 min
Real-time
Caching
