System Design
Posts about scalable system design.
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The Webhook Bug That Gives Cancelled Users Free Access
Payment webhooks arrive out of order, and a naive handler hands out free subscriptions. A lead engineer's guide to robust Stripe webhook handling: deduplication, race conditions, fetching current state, reconciliation - with PHP and Symfony examples.
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What Makes an API Scalable? A Solution Architect's Perspective
Scalable APIs survive more traffic, more consumers and more years. A solution architect's guide to contracts, statelessness, data access, caching, idempotency, rate limiting and evolution - with PHP and Symfony examples.