---
title: "Build & Test Acceleration"
description: "Shorten build and test feedback loops with caching, parallelization, and runners tuned to your workloads."
url: https://www.callstack.com/services/build-test-acceleration
updated: 2026-11-09T15:59:28.383Z
---

# Build & Test Acceleration

Shorten build and test feedback loops with caching, parallelization, and runners tuned to your workloads.

_[Expert Engineering](/ai-native-engineering) › [Enterprise Infrastructure](/capabilities/self-hosted-ci-cd-infrastructure)_

**Feedback in minutes, not coffee breaks**

Slow builds tax every engineer and every agent, on every change. We profile your build and test pipeline, then attack the top offenders with caching, parallelization, and hardware tuned to the workload.

## Enterprise Infrastructure

- ISO 27001 certified
- 100+ Enterprise projects delivered
- React Foundation Founding Member · 300+ commits to React Native · Contributing since 2016
- Industry runs on our tooling · 50M+ OSS downloads / month
- 10 min From code change to mini-app release
- 60 → 10min Faster builds after replacing Jenkins with EAS

## What you get: Every loop, measurably shorter.

- **Build profiling** Where the minutes actually go: measured, not guessed.
- **Remote and local caching** Compilation and dependency caches shared across CI and developer machines.
- **Test parallelization** Suites split, sharded, and balanced across runners.
- **Runner tuning** Machine classes matched to workloads, with Apple silicon where it pays.
- **Selective execution** Only affected tests and targets run per change.
- **Regression guardrails** Build-time budgets enforced in CI, so speed does not erode back.

## How we work together: Improve the system without disrupting delivery.

### Extend your team (1 week)
Our senior engineers join your team to ship features, guide technical decisions, and strengthen delivery.
- Your roadmap and workflow
- Expertise shared as we work
- Flexible timezone coverage
### Deliver a project (1-12 months)
We take agreed work from technical planning to release, with clear responsibilities and progress you can see.
- 3 Callstack engineers ship like 6
- Impact visible before sprint two
- End-to-end delivery
### Solve specific challenge (as needed)
We address a performance, migration, or infrastructure challenge, or run training around your team’s needs.
- Focused reviews or implementation
- Knowledge your team keeps
- Outcomes guaranteed with contract

## What shipping at AI speed looks like.

- [Cutting Mobile Build Times by Up to 79% for a Southeast Asian Bank](/case-studies/cutting-mobile-build-times-by-up-to-79-for-a-southeast-asian-bank): 2.4× faster iOS cache-hit builds on average
- [Accelerating Teamworks' Mobile Delivery With Re.Pack and Module Federation](/case-studies/accelerating-teamworks-mobile-delivery-with-re-pack-and-module-federation): 10 min from code change to mini-app release
- [Migrating a Legacy React Native App to Expo for Faster Builds and Simplified Releases](/case-studies/migrating-a-legacy-react-native-app-to-expo-for-faster-builds-and-simplified-releases): 6x faster builds after replacing Jenkins with EAS
- [Building Scalable Observability for a High-Growth React Native App](/case-studies/building-scalable-observability-for-a-high-growth-react-native-app): 3→1 analytics systems unified into a single interface

**Get your minutes back.** Measured acceleration across build and test, with budgets that keep it fast. [Book a call](/contact)

> We had been struggling with React Native application performance until we met Callstack. 
>
> — Huỳnh Chí Hùng, Associate Director, MOMO

We’ll connect you with the right expert within 24 hours.

## Let’s find the right path for your product.

**What gains should we expect?**

Starting points vary too much for one number, but native build caching and test sharding routinely cut feedback time by half or better. The profiling phase quantifies it for your pipeline first.
**Does this work in a monorepo?**

Yes. Affected-target detection and per-package caching are exactly where monorepos win back the most time.
**Can you fix React Native native build times specifically?**

Yes. iOS and Android compilation, dependency prebuilds, and CI cache design for native artifacts are core to this work.
**What does caching infrastructure cost to run?**

A fraction of what it saves in runner minutes and engineer wait time. We include the infrastructure cost in the before/after math.
**Does it work with EAS or hosted CI?**

Yes. Acceleration applies whether you build on EAS, hosted CI, or your own runners - the techniques move with you.
**How do we keep it fast afterwards?**

Build-time budgets in CI fail a PR that regresses the pipeline, the same way a failing test would.

## Open source

- [React Native Community CLI](https://github.com/react-native-community/cli): Command line tools to help you build React Native apps
- [Re.Pack](https://re-pack.dev/): A webpack-based toolkit to build your React Native application with full support of webpack ecosystem
- [React Native Builder Bob](https://github.com/callstack/react-native-builder-bob): Simple set of CLIs to scaffold and build React Native libraries for different targets
- [Rock](https://www.rockjs.dev/): Modular toolkit for teams building React Native apps
- [Agent Skills](https://github.com/callstackincubator/agent-skills): Callstack’s best practices on React Native performance optimization, upgrading, CI workflows, and brownfield migrations