A Demand Side Platform (DSP) developer designs, builds and maintains software platforms that allow advertisers to buy digital ad space automatically, in real-time. They manage the bidding process, optimize ad buying algorithms, and integrate with data management platforms for targeted advertising. They ensure the DSP interfaces with Supply Side Platforms (SSPs) and Ad Exchanges effectively. They also monitor campaign performance, troubleshoot issues and enhance the platform's functionality. Their work is crucial in facilitating programmatic advertising, making it more efficient and cost-effective for advertisers. They must have strong programming skills and a deep understanding of digital advertising ecosystems.