Building effective machine learning (ML) systems involves more than just training and evaluating models; it requires a comprehensive infrastructure that includes feature stores and FTI (feature, training, inference) pipelines to manage data transformations, model training, and predictions. A feature store acts as a central data platform, storing pre-computed features and ensuring that models receive consistent data throughout their lifecycle. This architecture supports various types of ML systems, such as batch, interactive, and streaming, by providing real-time access and transformation of data. The article highlights the importance of precise definitions and the challenges of matching pipeline outputs to inputs, emphasizing that feature stores mitigate these issues by offering a structured approach to feature management. Furthermore, MLOps practices such as automation, versioning, and comprehensive testing are crucial for maintaining and upgrading ML systems, ensuring that new models integrate seamlessly with existing infrastructure. The article provides examples of ML systems built using this architecture, demonstrating its applicability across different domains, and offers resources for learning more about serverless ML development, highlighting the benefits of using free tools and platforms.