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Publish/subscribe is often the first pattern teams adopt when moving toward asynchronous, message-based architectures. It’s a powerful way to decouple services and enable extensibility—but on its own, pub/sub doesn’t solve many of the problems that show up in real distributed systems, such as data loss, broken workflows, or systems that struggle under load.

In this session, we’ll go beyond basic pub/sub to explore a set of proven messaging patterns used in production. We’ll look at how the Outbox pattern prevents message loss during failures, how sagas coordinate long-running workflows without distributed transactions, how scatter-gather accelerates work through parallelism, and how competing consumers enable elastic throughput when demand spikes. Along the way, we’ll also examine essential operational safeguards such as retries, dead-letter queues, back pressure, and idempotency.

By the end of the talk, you’ll understand when and how to apply these patterns to build systems that are not just decoupled, but resilient, scalable, and designed to handle failure gracefully from day one.

NDC Conferences

Pub/sub provides decoupling but doesn't solve distributed system challenges like data consistency, workflow coordination, or failure handling. Advanced patterns address these: transactional outbox ensures atomicity between database writes and message publishing; sagas coordinate long-running workflows with compensation logic; scatter-gather parallelizes work for aggregated results; competing consumers scale throughput; and retry strategies with error queues handle transient failures. Apply patterns incrementally based on specific pain points rather than adopting everything at once.

Beyond Pub/Sub - Advanced Messaging Patterns - Poornima Nayar - NDC London 2026