Building at Massive Scale -- Citadel's Technology Infrastructure and Engineering Culture

Citadel and Citadel Securities are, at their core, technology companies that happen to trade financial instruments. This module covers the engineering infrastructure powering $652 billion in daily trading volume: the Google Cloud partnership enabling 1 million+ concurrent cores, the "5,000 Goals" infrastructure consolidation initiative, low-latency C++ execution systems, and the AI/ML stack that has been core to trading since the 1990s. For engineering candidates, this is essential context for system design rounds and "why Citadel" questions.