Shopify handles billions of Black Friday requests on a modular monolith, built with Ruby on Rails and kept in check by Packwerk. Domain boundaries are enforced. Chaos averted.
Inside, it blends Hexagonal Architecture, isolated Pods, and real-time Kafka pipes. The system scales without fracturing into microservices confetti.
System shift: Monoliths aren't deadβthey're just disciplined now. Clean code, strong boundaries, fewer regrets.
