Nautilus Trader is a production-grade, Rust-native trading engine designed for multi-asset, multi-venue trading systems. It features a deterministic event-driven architecture that enables research-to-live parity, allowing strategies to be developed, backtested, and deployed live with consistent behavior. The system comprises a core Rust engine with Python bindings for strategy development, modular adapters for over 20 exchanges (including Binance, Coinbase, Kraken, and DeFi platforms), and infrastructure for backtesting, live trading, risk management, and analysis. Key components include a CLI tool for system management, a LiveNode for production trading, and a BacktestNode for historical strategy evaluation. The architecture emphasizes modularity, with separate crates for model, core, execution, trading, risk, analysis, persistence, serialization, and exchange-specific adapters, all communicating via an actor-based message bus.