RobloxSystem Design·60 minMembers
Near-Real-Time Friend-Played-Game Counter
Members only
Design a service that, for a given (user, game) pair, surfaces near-real-time signals: how many of the user's friends have played the game, plus the total active-player count for the game. Targets 10M...
SWE
Infra Eng
system-design
scaling
social-graph
feed
fan-out
redis
caching
hard
Frequency
Low
Last asked
2026-06-19
Stage
phone-screen · onsite-system-design
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