System
City
Workspace
Problems
Canvas
Pricing
Sign in
Design an Online Presence Indicator Service — Easy System Design Problem
Back to problems
Easy
SYSTEM DESIGN
·
Messaging
Design an Online Presence Indicator Service
WebSocket
Heartbeat
Upgrade to view full problem details
Upgrade to Premium
Related System Design Problems
Browse all →
Medium
Messaging
Design Facebook Messenger
#Chat
#Real-time
#Presence
Hard
Messaging
Design a Distributed Messaging System
#Pub/Sub
Real-time
Open Canvas
Upgrade to Premium to unlock this problem
#Ordering
#Replication
Hard
Messaging
Design a Push Notification Service
#Push
#APNS/FCM
#Targeting
Easy
Social Media
Design a Nested Comments System
#Tree Structure
#Pagination
#Real-time
Easy
Data
Design a Weather Reporting System
#Aggregation
#Geo
#Real-time
Easy
IoT
Design an Efficient Parking Lot System
#Sensors
#Real-time
#Allocation