Discover how to build personalized, real-time feeds at scale using Apache Pulsar! In this talk, we explore a Pulsar Function–based pattern for filtering and routing messages across multiple topics based on dynamic subscriber-defined key sets.

Originally designed for a real-time stock portfolio tracker, this approach generalizes to many use cases, including:

• Personalized content feeds
• IoT device filtering
• Geo-targeted alerts
• Dynamic subscription models

You’ll learn:

• How to implement a dynamic filtering layer with Pulsar Functions
• Techniques for maintaining per-user keysets efficiently
• Scaling patterns for horizontal distribution and user-specific routing
• How this solution can be applied across industries and domains

Whether you’re building personalized user experiences, targeted analytics, or smart alerting systems, this talk provides a reusable pattern for scalable, filter-based stream routing with Apache Pulsar.