Real-Time, Chat & Location

Messaging, presence, ride matching, and live collaboration.

0 / 9 solved

Question Tags Difficulty Success

1. Ten Days Per Bucket

partitioningwide-column-store +2

Medium —

2. Thirty Thousand Sends

fanoutactor-model +2

Medium —

3. Delivered Twice Design

messagingrealtime +4

Hard —

4. Nearest Driver Wins Design

geospatialrealtime +3

Hard —

5. Seats Are Selling Design

concurrencyflash-sale +4

Hard —

6. The Empty Channel Scan

lsm-treetombstones +2

Hard —

7. Channels Have One Home

message-orderingmulti-region +2

Hard —

8. AB Or BC

collaborative-editinglast-writer-wins +2

Hard —

9. Same Doc Same Time Design

realtimecollaboration +4

Hard —

partitioningwide-column-storecapacity-planningdiscordfanoutactor-modelhot-partitionmessagingrealtimewebsocketsidempotencyend-to-end-encryptiongeospatialmatchingstreamingconcurrencyflash-saledistributed-lockingtransactionspaymentslsm-treetombstonescompactionmessage-orderingmulti-regionstateful-servicesslackcollaborative-editinglast-writer-winsconflict-resolutionfigmacollaborationcrdtconsistencyoffline-sync+1+2+3+4+5+6

Up next

9 of 9 questions here are still unsolved.

Next module Data & Analytics Pipelines