App Performance Optimization

A holistic approach to optimizing app performance: diagnostics, fixes, and futureproofing

Estimate project
Contact us
* Please note the trainings module are companies-oriented, not for individual users.

What we deliver

It’s crucial to identify and fix issues that hinder the performance of your app if you want to ensure a positive user experience and maximize the app's success.

Let us audit your application for potential problems, fix them, and take measures to prevent them in the future.

Performance audit report

Presentation of the report to your team

Implementation of suggested solutions

Regression prevention suite

Trainings level A

State Management With Redux

Every app we write has some kind of state – it could be a shopping list or a gym schedule. The more complex our apps get, the more state they need to manage, hence the need for managing it properly. One of the most popular state management libraries is Redux – a single-tree storage based on Flux architecture.

Callstack illustration
Trainings level A

Testing

Let’s say you have a perfect bug-free app you’re very proud of. Does it change over time? How many developers work within the same codebase? How familiar are they with this code? How do you ensure your code is still perfect? The answer is automated testing, and this workshop is all about it. Let’s take a deep dive into this fascinating world to boost your confidence from shipping to production!

Callstack illustration
Trainings level A

Navigation in React Native

Navigation has been a hot topic in React Native from day one. There have been many attempts to solve it. All of them follow different concepts and might fit better or worse for different use-cases. In this section we’ll present market leading solutions and teach participants about their differences and when to use one or another.

Callstack illustration
Trainings level A

Intro to React

The following course provides a basic introduction to all of the concepts behind React. The scope of this module lets participants understand the architecture of React and includes the patterns used in daily development. It contains all the knowledge required to get up and running with React.

Callstack illustration
Trainings level A

Intro to Modern JavaScript

This module is designed to help people who don’t have much experience with JavaScript or haven’t had a chance to work with modern JavaScript codebases. It will provide a good technical background to start working with React and React Native or JavaScript in general.

Callstack illustration
Trainings level A

Essential React Native

In this workshop, attendees will learn how to build a real mobile app that's indistinguishable from an app built using Objective-C or Java. React Native uses the same fundamental UI building blocks as regular iOS and Android apps. You just put those building blocks together using JavaScript and React. We’ll guide participants through the framework, ecosystem, syntax, and best practices to build a real-world application.

Callstack illustration
Trainings level B

Universal React

One of the biggest advantages of React in comparison to other cross-platform technologies is the fact that it supports not only mobile platforms, but also web browsers. In this workshop we’ll play with ReactXP, the library that builds abstraction over React Native, React Web and React Windows. The scope of this workshop is to introduce best practices in writing cross-platform apps, present the best techniques to write code that will be universal across platforms, and provide a few ideas on how to handle the differences in a gentle way.

Callstasck Tornado
Trainings level B

Working With Native Modules

The goal of this workshop is to show participants how to write native modules that work well with React Native. We’ll show how to write such a module using Swift and Kotlin. Participants will learn how to bridge not only the APIs but also the native views that are ready to be used in JavaScript.

Callstasck Tornado
Trainings level B

React Native Performance

The following course is designed for developers who have production experience with React Native. The scope dives deep into the native side of the framework. It’s a very low level in terms of React Native development. The course tackles a lot of the iOS and Android application development topics. It’s perfect for gaining a wide overview of mobile app creation, and lets you look at React Native in a different way.

Callstasck Tornado
Trainings level B

Delightful UX With React Native

Modern applications contain a lot of beautiful designs and highly focus on user experience. The basic React Native knowledge is in most cases not enough to ship a 5-star store application. This module is designed for developers who already have some experience in writing React Native but want to extend their knowledge in terms of writing beautiful and usable applications. We’ll tackle navigation and animation-related topics that can make all the difference for the end users of the application.

Callstasck Tornado
Trainings level B

Continuous Integration & Continuous Deployment

Automation of development and deployment flows are really important these days. Not only that not many companies can afford a dedicated DevOps team to handle the releases, but also that the human factor might slow down a lot of the things in the delivery process. This workshop is aimed at teaching participants how to create an automated pipeline that will increase your code quality by performing various checks and deliver the builds to the testers or the stores with simple git merges.

Callstasck Tornado
Trainings level B

Concurrent React

As Dan Abramov, co-author of Redux and one of the main Reactjs contributors tweeted: “Concurrent React is not a set of new APIs. It’s more like lifting some restrictions on what React can do.” This is exactly what this section is about. We’ll introduce new concepts (and the corresponding APIs) of React 16+ that makes it even more asynchronous and prepares developers to write the next generation React code.

Callstasck Tornado
Trainings level B

Code Quality With Flow

The code quality section is crucial for developers that are new to the React or React Native ecosystem. We introduce the tooling that is used to help teams develop better products and improve code stability. The static type analysis tool used in this module is Flowtype.

Callstasck Tornado
Trainings level B

Code Quality With TypeScript

The code quality section is crucial for developers who are new to the React or React Native ecosystem. We introduce the tooling that is used to help teams develop better products and improve code stability. The static type analysis tool used in this module is TypeScript.

Callstasck Tornado
Trainings level B

Deep Dive Into React

The content of this course is designed for developers who have some experience with React. Those who have been working with React for a while and are looking to improve their skills should benefit the most from this workshop. Participants should be able to write more declarative code and design their components in a way that allows apps to scale well.

Callstasck Tornado
Trainings level B

Apollo-Client Masterclass

GraphQL is becoming more popular every day. It’s a step forward in the communication between front end and back end. It simplifies a lot of the things, especially on the front-end side. It introduces the techniques required to write real-life apps based on GQL and Apollo. This workshop is designed for people that are either not yet familiar with GraphQL itself or want to improve their skills in Apollo Client usage.

Callstasck Tornado
Callstack Cosmos

How you will benefit from a future-proof app performance

Having a future-proof application lets you handle increased user load and evolving technologies without major disruptions or performance degradation. It enables your business to adapt to emerging trends, integrate new technologies, and scale effectively.

What you get

Better UX & CRO

  • Improved user experience (UX), which results in higher user retention and satisfaction
  • Faster conversion interactions (e.g. add-to-cart, checkout) 
  • Full control over crucial performance metrics
  • Quicker bug discoveries and fixes

Beter processes

  • Improve app performance before regressions hit your users
  • Proactively address performance issues (vs. reactively addressing user feedback)
  • Automate performance measurements so they do not waste your team’s time

What challenges we address

User dissatisfaction with slow app startup and poor responsiveness

App uninstallations due to excessive app size reported by users

User preference for faster apps offered by competitors

Lengthy and slow app interactions

Lack of smoothness in the app animations and functions

Our process

How we work on your app performance

We apply the DMAIC process:

Define - Get to know your project & business

Measure & Analyse - custom performance audit, including:

  • FPS analysis
  • TTI analysis
  • App (JS bundle size + Native bundle size) size analysis
  • CPU usage analysis 

Implementation - of report items

Control -  recommendations on controlling and preventing future technical debt, and implementing prevention tools and processes to your project and team

Related services

Service

Technical Debt Reduction and Prevention

Diagnosing and fixing technical debt

Callstasck Tornado
Service

App Maintenance

Support and maintain your app after its release

Callstasck Tornado
Service

Development Efficiency Boost

Remove the technology and process obstacles that stop your team from working efficiently

Callstasck Tornado
Service

Architecture Redesign

Change the way you approach your application’s technology, tools, processes, and structures

Callstasck Tornado
Service

Tech Scalability

Migrate to the React Universe to scale your technical solution

Callstasck Tornado

Process Step by Step

#1
Pick the modules you find useful for you and your developers team
#2
Fill out the form with your needs and expectations; we'll strive to meet them
#3
We will reach out to you to discuss the details
POWERED BY

REACT UNIVERSE

Instead of splitting development across multiple languages, platforms, and teams, React Universe combines front and back-end development with cross-platform capabilities using a single programming model.

Deep dive into React Universe

get in touch

Trusted by

“The team at Callstack are the most experienced and trusted engineers in the React Native community and ecosystem.”

Nader Dabit

DevRel + XD at EigenLayer / EigenDA

at Amazon Web Services

This information will be used only to contact you. For details, check our Privacy Policy.

Choose module for your React Native Training for Enterprises

This information will be used only to contact you. For details, check our Privacy Policy.
Contact us
* Please note the trainings module are companies-oriented, not for individual users.

App Performance Optimization

Join The Program

Callstack needs the contact information you provide here to contact selected candidates about the program. For more information, check our Privacy Policy

Services icon
easier by default
Insights included.
Duration
A 1-week program with minimal effort on your end.
Program rules
Please note that we reserve the right to contact only selected candidates.
EXPERIMENTAL, YET SAFE

How you will benefit from a future-proof app performance

Having a future-proof application lets you handle increased user load and evolving technologies without major disruptions or performance degradation. It enables your business to adapt to emerging trends, integrate new technologies, and scale effectively.

statictics
Approach
SLOWLY BUT SURELY
To implement the React Compiler smoothly into your existing project, it’s recommended to take a rather careful approach:
01
start small
Test the waters by running the Compiler on a small part of your project to see how it shakes out.
02
EXPAND GRADUALLY
As you build proficiency, slowly unleash the Compiler on more parts of your code until your whole app gets the proper kick.
03
USE ANNOTATIONS
Sprinkle in use memo and use no memo directives to steer which components get optimized, keeping everything stable as you level up.

Beter processes

  • Improve app performance before regressions hit your users
  • Proactively address performance issues (vs. reactively addressing user feedback)
  • Automate performance measurements so they do not waste your team’s time
Sign up now
process

GUIDED IMPLEMENTATION, EASIER BY DEFAULT

So, what does it take to get started?
Our experience helped us to design a process that’s easier than you think:
01
BLINK AND IT'S DONE
Just 1 week to complete the program
02
HARDLY ANY SWEAT
Only a few hours of your time
03
MAXIMUM GUIDANCE
Get the tool up and running fast
04
LASTING IMPACT
With detailed recommendations and insights
Please note that we reserve the right to contact only selected candidates.

DARE TO INNOVATE?

Sign up for our program today. The spots are limited, so act fast, and let’s kick it off together!
Sign up now

or... NEED MORE PROOF?

Check our blog post to explore the core benefits of the React Compiler and our testing results.
Read blog article