---
title: "From Hours to Minutes: Making Your React Native CI Builds 20x Faster"
description: "Discover how to skip 90% of native builds in React Native CI using Rock. Includes a live demo and cost-saving insights from Expensify’s setup."
url: https://www.callstack.com/events/from-hours-to-minutes-making-your-react-native-ci-builds-20x-faster
updated: 2026-11-06T10:04:44.463Z
---

# From Hours to Minutes: Making Your React Native CI Builds 20x Faster

Discover how to skip 90% of native builds in React Native CI using Rock. Includes a live demo and cost-saving insights from Expensify’s setup.

_Webinar · 5/12/2025, 6 PM [CET] · Online · Recording: 01:04:33 · Category: Enterprise_

Organizer: Callstack

Speakers: Michał Pierzchala (Principal Engineer @ Callstack), Mike Grabowski (CEO & Founder @ Callstack)

[Watch the recording](https://www.youtube.com/watch?v=XL2hKPR7waY)

What if 90% of your React Native builds didn’t need to be built at all?

In this recorded webinar, Mike Grabowski (CTO, Callstack) and Michał Pierzchała (Principal Engineer, Callstack) walk you through how Callstack’s recently open-sourced [Rock](https://enterprise-framework.callstack.com/) makes that possible.

You’ll see how Expensify used Rock to reduce debug build times from 40 minutes to 2 minutes, without switching CI providers or sacrificing control.

With a live demo, real GitHub Actions pipelines, and concrete cost comparisons, this session gives you a practical look at native build caching that works across local dev, CI workflows, and end-to-end tests.

### What you’ll learn:

- How to avoid native builds 90% of the time using smart fingerprinting
- Why typical caching setups fail, and how to fix them
- How Rock brings modularity, flexibility, and speed to large-scale React Native projects
- How to incrementally adopt the framework in existing Community CLI projects

Whether you're stuck waiting on CI or scaling a growing React Native codebase, this webinar shows you how to ship faster, without paying more.