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Build · break · understand
Two complete practice environments with saved attempts, run-to-run comparison and an engineering notebook.
HLD · Workload experiment
Configure request rates, cache hits, API and database capacity, then simulate viral traffic, a cache outage or an analytics outage. Compare async analytics with a blocking dependency and inspect rejection, backlog and loss.
Open studioLLD · Runnable implementation
Edit a deliberately buggy JavaScript implementation and run six behavioral scenarios in a sandboxed worker: last-spot races, compatibility, unknown payments, failed payments, repeated exits and unknown tickets.
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