Inverting the Architecture: Breaking a Fantasy Football League out of a single tournament

The World Cup is the biggest sporting event in the world, and developers everywhere build apps around it to bring fans closer to the action. We wanted to join in, so we built a fun serverless fantasy football app for the tournament, one that handles unpredictable traffic surges every time a game kicks off. Then we asked: what if this wasn’t just for one tournament, or even one sport?

We inverted the architecture, extracting a single-event app into an extensible multi-sport engine. You’ll see the production application and the real code behind it: how we isolated per-sport traffic with multi-tenancy patterns, modelled flexible data structures in serverless databases, and used event-driven patterns to survive game-day traffic spikes while keeping the frontend responsive.

No abstract theory. We open the repo and show you best practices for building scalable serverless frontends and backends and that hold up when it matters most.