There are many ways to implement entity resolution (ER) system — both using vendor software and open-source libraries that enable DIY Entity Resolution. However, generally we see common challenges with any approach — scalability, bound to a single model architecture, lack of metrics and explainability, and stagnant implementations that do not "learn" with experience. Recent experiments with transformer-based approaches, fast lookups with vector search and Databricks components such as Databricks Apps and Agent Eval provide the foundations for a composable ER system that can get better with time on your data. In this presentation, we include a demo of how to use these components to build a composable ER that has the best outcomes for your data.