---
title: "Guide to Projections and Read Models in Event-Driven Architecture"
url: https://daily.dev/posts/guide-to-projections-and-read-models-in-event-driven-architecture-omoo7obwt
source_url: https://event-driven.io/en/projections_and_read_models_in_event_driven_architecture
type: article
source: "Event-Driven by Oskar Dudycz"
published: 2026-06-17T11:26:08.873Z
updated: 2026-06-17T11:31:29.873Z
tags: ["architecture"]
reading_time: 17
upvotes: 0
comments: 0
language: en
---

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# Guide to Projections and Read Models in Event-Driven Architecture

**[Event-Driven by Oskar Dudycz](https://daily.dev/sources/event-driven-io)** · 17 min read · 0 upvotes · 0 comments

## Summary

A comprehensive guide to projections and read models in event-driven architecture. Covers the left-fold pattern for building read models from events, synchronous vs asynchronous projections, projection rebuilds (including blue-green rebuilds for zero downtime), idempotency strategies, handling eventual consistency with business stakeholders, and scaling through data partitioning. Includes C# code examples demonstrating shopping cart projections using both in-memory state updates and direct SQL approaches.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://event-driven.io/en/projections_and_read_models_in_event_driven_architecture>

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Tags: [#architecture](https://daily.dev/tags/architecture)

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