Selecting Ad Objects in DSP: The Cost of Finding the Right Banner in 100 Milliseconds

This article explores the architectural challenges of developing Demand Side Platforms (DSP) within the RTB advertising ecosystem. The author examines the complexities of high-load systems that must process a stream of bid requests and match appropriate ad objects based on targeting within a strict 100-millisecond window, which includes network latency and bid calculation. Special attention is given to the choice of data storage and architectural scalability, as these factors directly determine the platform's throughput during traffic spikes. The author highlights the importance of understanding technical constraints for effective collaboration between product managers and developers, while analyzing how various engineering approaches impact the performance and flexibility of an ad engine in real-time environments.