Tag
#idempotency
2 articles tagged idempotency.
HLDintermediate
Newsletter Service HLD: Fan Out a Million Emails Without Sending Twice
A newsletter service system design: fan a campaign out to millions of subscribers, the send-log idempotency key that stops double-sends, plus deliverability, retries, and open/click tracking.
14 min read
LLDintermediate
Online Voting LLD: The Design Where You Destroy the Join on Purpose
A low-level design walkthrough of an online voting system: separating eligibility from the ballot so one vote per voter never links who voted to what, with an append-only, recountable tally.
10 min read