Kaan Keskindil enhanced the MQSMaster repository by implementing a dynamic lookback window for backtest data retrieval, focusing on improving reliability and stability in quantitative strategy evaluation. Using Python and leveraging skills in backtesting and data engineering, Kaan ensured that historical data is fetched within the correct window relative to the end date, reducing data leakage and supporting more accurate results. Additionally, Kaan addressed a configuration issue by correcting a misnamed environment variable in the MQSDBConnector, which improved database connection stability. The work, consolidated in a single commit, demonstrated thoughtful change management and contributed to more dependable deployment workflows.