---
title: "Monolith to Service Architecture"
url: https://daily.dev/posts/monolith-to-service-architecture-2izyvqort
source_url: https://newsletter.systemdesigncodex.com/p/monolith-to-service-architecture
type: article
source: "System Design Codex"
published: 2026-06-23T08:07:10.592Z
updated: 2026-06-23T08:07:32.576Z
tags: ["career", "architecture", "microservices", "change-data-capture"]
reading_time: 4
upvotes: 102
comments: 4
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Monolith to Service Architecture

**[System Design Codex](https://daily.dev/sources/systemdesigncodex)** · 4 min read · 102 upvotes · 4 comments

## Summary

Migrating from a monolith to microservices requires deliberate patterns rather than a big-bang rewrite. Four key strategies are covered: the Strangler Fig Pattern (incrementally routing traffic to new services via an API gateway), the Parallel Run Pattern (running both systems simultaneously to validate equivalence), the Collaborator Pattern (decorating the monolith with microservices that add new behavior without touching core logic), and Change Data Capture (streaming database changes in real-time using tools like Debezium or Kafka Connect to keep microservices in sync). These patterns are most effective when combined in sequence during a migration.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://newsletter.systemdesigncodex.com/p/monolith-to-service-architecture>

## Community discussion

Top comments from developers on daily.dev.

**@ajaychoudhary80** · 2 upvotes

> Patterns reduce migration risk by turning one big problem into many small ones.

**@erikandersoon** · 2 upvotes

> This is the most practical guide to monolith-to-microservices migration I've seen. The key insight is that successful migrations are _incremental_, not a big-bang rewrite. The Strangler Fig Pattern is the cornerstone—routing traffic gradually to new services gives you time to validate and roll back if needed. Parallel Run adds confidence by comparing outputs between old and new. The Collaborator Pattern is clever: instead of rewriting core logic, you wrap it with microservices that add new features, allowing you to build value while you migrate. And CDC is the unsung hero—it keeps the old and...

**@deepjoshi\_dev** · 0 upvotes

> I kind of agree on this take.

## Similar posts on daily.dev

- [How to Move from Monolith to a Service Based Architecture](https://daily.dev/posts/how-to-move-from-monolith-to-a-service-based-architecture-8wr0lttmy) · System Design Codex · 74 upvotes · 3 comments

---

Tags: [#career](https://daily.dev/tags/career), [#architecture](https://daily.dev/tags/architecture), [#microservices](https://daily.dev/tags/microservices), [#change-data-capture](https://daily.dev/tags/change-data-capture)

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