Building a trading system is easy. Building one that survives a flash crash while processing millions of events per second is a different challenge entirely. After building production-grade infrastructure for our own quant ventures, we've distilled several architectural patterns that are non-negotiable.
1. The Immutability Principle
State is the enemy of high-frequency execution. Every signal, every order, and every trade in our system is immutable and event-sourced. If it happened, it's a fixed point in history. This makes debugging trivial and rollback impossible to mess up.
2. Deterministic Backtesting
If your backtest doesn't perfectly match live performance, you're not trading — you're gambling. We built a universal backtester that uses the exact same execution logic as our live bots, ensuring 99.9% parity between simulation and reality.
3. Risk as a First-Class Citizen
Every order goes through a risk engine before execution. Position sizing is dynamic, based on ATR and account equity. Trailing stops adjust in real-time. There's no manual override — the system protects capital autonomously.