Qf-lib -

Abstract This paper introduces QF-Lib, an open-source quantitative finance library designed to bridge the gap between financial research and production-ready trading systems. Built in Python, QF-Lib provides a modular, event-driven framework for strategy development, historical backtesting, and live trading. This paper discusses its core architecture, key components (data handling, execution simulation, risk management), and practical applications. We evaluate its performance against alternative frameworks and demonstrate a simple moving average crossover strategy. Results indicate that QF-Lib offers a robust balance of flexibility, transparency, and speed for quantitative researchers.