Design
Cricket Scoreboard / Live Scoring
Design a live cricket scoring system supporting match setup, ball-by-ball scoring, innings management, and score broadcasting.
01 - Why interviewers ask this
It's a rich state-machine-plus-derived-statistics problem — interviewers check whether you compute stats from an immutable ball-by-ball log instead of mutating running totals directly (which drifts and is hard to audit).
02 - Where this system exists in the real world
You interact with this design every day.
Cricbuzz / ESPN live scoring platforms
Sports broadcasting graphics systems
Fantasy sports statistics engines
03 - What you'll master
Solve this once. Know it forever.
Model an immutable, append-only event log
Derive statistics from raw events, not mutation
Use Observer to broadcast live score updates
04 - What you'll design
7 functional · 3 non-functional requirements.
Set up a match: teams, players, venue, format (Test, ODI, T20)
6 more requirements inside
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05 - Companies that ask this
You may face this exact question in your next interview.
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