A/B testing is a strategic approach to determine the most effective marketing tactics by comparing two options, such as web page designs, to see which better engages a target audience. This method becomes more efficient when done in real-time, providing immediate insights for actionable decisions. The integration of Redpanda and Apache Druid facilitates real-time A/B testing by processing streaming data and enabling fast analytical queries. The article outlines a practical implementation using these technologies, where events generated from user interactions are streamed to Redpanda, then ingested into Druid for analysis. This setup allows for dynamic adjustments to testing parameters based on real-time data, optimizing marketing strategies to enhance customer engagement and sales conversions. Moreover, the combination of these tools minimizes human error and time consumption, making it a valuable asset in the competitive technology market.