Photo by Iker Urteaga on Unsplash


Paul Sweeney
8 min readMay 26, 2019

Do you have a large scale UI that takes way too long to rebuild? Do you have multiple teams and frequently run into code conflicts and other integration issues? Is an app responsible for too many features? Micro-frontends can probably help you here. Micro-Frontends takes the Micro-Services architecture concept from backend engineering, and applies it to frontend development. But how can splitting the UI into multiple frontends help to scale your project?

In my previous job, from 2012 until 2016, I was the lead developer for a multinational company’s UI framework, where our team designed and implemented a micro-frontend architecture. In this article, I’ll share some of the benefits, and things I’ve learned through working with micro-frontends.

What are Micro-Frontends?

Micro-Frontends have no defined framework or API, it’s an architectural concept. The main premise behind micro-frontends, is splitting your app into several smaller apps, each with their own repositories, that are focused on a single feature. This architecture can be applied in many different ways. The architecture can be as liberal as possible, where each app could be implemented with different frameworks, or the it could be more prescriptive, providing tools and enforcing design decisions. There’s benefits and downsides to both of these approaches, and they largely depend on your organisation’s needs.

An important thing to highlight with micro-frontends, despite splitting the app into several projects, they would be integrated together at the end into a Single Page App. To the end user, it would all appear to be one app, not many. Usually, there would be a parent runtime that would handle the lifecycle of each app, so that it gives the experience of a single page application. So you’re not losing anything in terms of user experience by implementing this architecture.

When to use this architecture?

In my opinion, the best approach to splitting an app is to split on unique sets of screens and features. Consider your mobile phone, on your phone, you have different apps with different features. You have a phone app for dialing, a messaging app for texting, and a contacts app for storing numbers. These apps often interop with each other, but they have very distinct…

Paul Sweeney

Software Developer. Opinions are my own.