https://ozersubasi.com/writing Notes on backend engineering, serverless architecture, and building products. en https://ozersubasi.com/writing/real-time-stock-control-aws-lambda https://ozersubasi.com/writing/real-time-stock-control-aws-lambda Wed, 10 Jun 2026 00:00:00 GMT How we kept inventory accurate across 23 airport duty-free stores with a serverless event-driven backend — and the trade-offs that came with it.