 |
Virtual Domain-driven designAuthor: Virtual Domain-driven design
If you don't live near an active Domain Driven Design meetup, or just want to get more in-depth knowledge of DDD, please join this vast growing community! Anyone is invited here. We strive to create a community of like-minded people eager to dive more into Domain Driven Design. We are going to organise panel discussions, community talks and more. So feel free to join us! Language: en Genres: Science, Social Sciences, Technology Contact email: Get it Feed URL: Get it iTunes ID: Get it |
Listen Now...
Surviving a National Blackout with Offline-First Architecture | Emilio Carrión
Wednesday, 5 August, 2026
We design for high availability assuming connectivity is always present. But what happens when a nationwide power outage leaves warehouses in the dark and cloud systems completely unreachable?During a major blackout that impacted most of Spain’s power grid, Mercadona Online had thousands of active orders mid-fulfillment across warehouses. While central systems went down, logistics operations had to continue.In this session, Emilio breaks down the architectural decisions — and the business trade-offs behind them — that made system survival possible:Local-first as a first-class citizen: how edge nodes operated in “bunker mode” with on-site compute, keeping warehouse operations running without central systems.The split-brain dilemma: managing state divergence between physical reality and the central database, and the rules that determined which side wins.The resurrection problem: reconciling millions of offline transactions once connectivity was restored, including race conditions and data recovery challenges.Every decision in this architecture was driven by real business constraints: SLAs with physical warehouses, perishable goods with expiration times, and logistics costs measured in thousands per minute of downtime.This is not a theoretical chaos engineering talk — it is a real-world case study of how architectural trade-offs made years earlier kept a critical business running when everything else failed.
