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# Independently together: how micro-applications improve developer experience + app performance

Monolithic SPAs destroy engineering velocity at scale. Micro-applications shatter the frontend monolith into fully independent, lightning-fast flows. Cut build times to minutes and empower your teams.

- **Speakers:** Bilal Cinarli
- **Event:** World Congress 2022
- **Published:** June 15, 2022
- **Duration:** 28:05
- **URL:** https://www.wearedevelopers.com/videos/452-independently-together-how-micro-applications-improve-developer-experience-app-performance

## Summary

At scale, monolithic Single Page Applications (SPAs) often bottleneck engineering velocity, leading to bloated bundles, massive deployment pipeline delays, and cumbersome local environments. To resolve these friction points when scaling operations—such as managing 200+ engineers across 71 teams at Adidas—the "micro applications" architecture applies the autonomy of microservices directly to the frontend. Unlike micro frontends that share a single application shell, a micro application is a fully independent SPA dedicated to one discrete page or user flow, such as a checkout sequence or a user dashboard.

By decoupling the monolith, engineering teams can independently develop, scale, and deploy their respective portions of the platform. The architecture relies on robust CDN orchestration to cache shared libraries (like React or state management tools), effectively keeping distinct bundle sizes extremely small, often under 100 kilobytes. Navigating between applications feels seamless for the end user because hosting all services under a single top-level domain allows session data to persist naturally through shared cookies and local storage.

Adopting micro applications radically improves the developer experience by reducing build times from nearly an hour to just a few minutes and significantly lightening local resource consumption. Giving individual teams control over their infrastructure removes single points of failure, ensures that traffic spikes only require scaling heavily used components, and minimizes the overall computational carbon footprint. However, this level of separation creates overhead around coordinating breaking changes and design systems, meaning this architecture is strictly recommended for vast, multi-team enterprise environments rather than small feature squads.

**Keywords:** frontend micro applications, enterprise frontend architecture, monolithic spa bottlenecks, distributed application routing, shared cdn dependencies, domain-level cookie sharing, microservices mentality for frontend, local environment optimization, resolving monorepo friction, decoupled single page applications, cross-team deployment life cycles, reducing deployment pipeline time, optimizing javascript bundle size, independent frontend scaling, web performance optimization

## Chapters

1. **Defining the concept and scope of micro-applications** (00:00) — Micro-applications introduce a full-scale architecture distinct from micro-frontends and microservices.
1. **Common bottlenecks in monolith application development** (00:53) — Large developer teams face friction from blockages like long deployment pipelines, slow page loading, and slow local environments.
1. **How modern web development breeds monolithic architectures** (03:08) — Overuse of single-page applications and monorepos often forces multiple teams into giant codebase bundles with overlapping goals.
1. **Transitioning from monoliths to independent application flows** (06:49) — Breaking down a large codebase allows domain-specific teams to maintain their own priorities and deployment lifecycles.
1. **Orchestrating micro-applications with shared state and libraries** (08:27) — Reverse proxies, content delivery networks, and domain-level cookies enable seamless transitions across isolated applications.
1. **Architectural definition and deployment logic for micro-applications** (12:12) — A micro-application operates as an independent, single-page flow with its own runtime and deployment infrastructure.
1. **Technical and organizational benefits of independent applications** (13:54) — Decoupled applications allow for isolated bug fixing, optimized browser caching, minimal bundle sizes, and faster local test runs.
1. **Managing dependencies and cross-team breaking change updates** (18:27) — Aligning frameworks across applications requires careful version management and open-source style communication for cross-team updates.
1. **Handling shared components and user interface consistency** (21:36) — Shared design systems and micro-frontends prevent redundant component creation while maintaining consistent user interfaces across decoupled flows.
1. **Evaluating organizational fit and specific technical edge cases** (24:26) — Micro-application architecture fits large-scale organizations best and relies on full-domain routing to share state seamlessly.

## Related Moments

- [Introduction to micro frontends and architectural consequences](https://www.wearedevelopers.com/videos/165-micro-frontends-with-module-federation-why-and-how) (from "Micro Frontends with Module Federation: Why and How?")
- [Introduction to micro frontend architecture](https://www.wearedevelopers.com/videos/318-destructuring-frontend-monoliths-with-microfrontends) (from "Destructuring Frontend monoliths with MicroFrontends")
- [Why companies scale application development with micro frontends](https://www.wearedevelopers.com/videos/165-micro-frontends-with-module-federation-why-and-how) (from "Micro Frontends with Module Federation: Why and How?")
- [Primary benefits of micro-frontend architectures](https://www.wearedevelopers.com/videos/299-micro-frontends-anti-patterns) (from "Micro-frontends anti-patterns")
- [Splitting large monolithic frontends for team autonomy](https://www.wearedevelopers.com/videos/1677-advanced-micro-frontends-multi-version-and-multi-framework-scenarios) (from "Advanced Micro Frontends: Multi-Version and Multi-Framework Scenarios")
- [Understanding the engineering benefits of micro-frontend architectures](https://www.wearedevelopers.com/videos/420-micro-frontends-anti-patterns) (from "Micro-frontends anti-patterns")

## Related Articles

- [Why You Shouldn’t Build a Microservice Architecture](https://www.wearedevelopers.com/magazine/118-why-you-shouldn-t-build-a-microservice-architecture)
- [Native Web Apps: Are We There Yet?](https://www.wearedevelopers.com/magazine/83-native-web-apps-are-we-there-yet)
- [Web Development Best Practices: What The Data Tells us](https://www.wearedevelopers.com/magazine/84-web-development-best-practices-what-the-data-tells-us)
- [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers)

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