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A complete system design walkthrough for a Try Before You Buy apparel marketplace: saga-coordinated trial orders, card authorisation holds, soft and hard inventory reservation, order and return state machines, automated pickup scheduling, courier anti-corruption adapters, warehouse QC, refund and restock flow, capacity estimation, security, and fraud prevention — illustrated with…
A complete, beginner-to-production system design walkthrough for handling supplier inventory feed delays and failures without ever overselling: circuit breakers, safety stock buffers, Kafka-backed ingestion pipelines, reservation with optimistic locking, reconciliation jobs, and end-to-end monitoring, illustrated with inline architecture and sequence diagrams and Java code.
A complete, beginner-to-production system design walkthrough for a real-time checkout A/B testing platform: deterministic edge-resolved bucketing, async Kafka-backed event ingestion, sequential-testing-safe statistics, guardrail-driven auto kill switches, and everything else needed to safely measure the effect of checkout-flow variants at a million-plus requests per minute without ever slowing checkout down.
