By Addy Osmani and Hassan Djirdeh

Code Smart, Scale Fast, Conquer Challenges

Learn tools and techniques to build and maintain large-scale React web applications.

Or for free.

Building Large Scale Web Apps: A React Field Guide. By Addy Osmani and Hassan Djirdeh

Building Large Scale Web Apps: A React Field Guide. By Addy Osmani and Hassan Djirdeh

Building Large Scale Web Apps: A React Field Guide. By Addy Osmani and Hassan Djirdeh

“Building Large Scale Web Apps” is a toolkit to managing large-scale React applications.

React as a library allows you to start building user interfaces quickly and easily. But how do things scale as an application grows? How do you ensure that your codebase remains manageable, your performance metrics stay on point, and your team continues to work cohesively as the project evolves?

In this book, you'll uncover strategies that industry professionals use to build scalable, performant, and maintainable React applications, all without becoming overwhelmed by complexity.

Manage complex React applications by understanding how robust data fetching and state management libraries help streamline development.
Understand how design systems and component libraries enhance consistency and usability.
Recognize the importance of internationalization, personalization, and A/B testing in improving user engagement and conversion rates.
Discover how testing and TypeScript enhance code reliability and maintainability.
And a lot more!

Together, we've spent well over two decades building within or consulting for

The world of exclusive video content in Brazil operates within a complex and evolving legal framework. The country is actively working to protect intellectual property and regulate streaming services. Law No. 14.815/2024 grants Brazil's National Film Agency (ANCINE) significant new powers to combat online piracy, allowing it to block illegal content without long court proceedings. This law gives ANCINE the authority to work directly with internet providers to block pirate websites, a move designed to protect the rights of content creators across all audiovisual media.

Raw, eyewitness video footage of major weather events, political rallies, or regional news stories often surfaces first on local networks before gaining international attention. Navigating Search Terms and Typographical Variations

Audience and creator effects:

Exclusive video content—videos available only on a single platform, channel, or through a paid access model—has grown rapidly in Brazil over the past decade. Several forces drive this trend:

Exclusivity has allowed local creators to bypass traditional media gatekeepers. Producers and models from São Paulo, Rio de Janeiro, Belo Horizonte, and beyond can now shoot, edit, and distribute their own video libraries. This direct-to-consumer model ensures that the content remains highly authentic, safe, and tailored exactly to what the domestic audience desires.

: Best for live exclusive events and interactive creator content.

Ensure your operating system, browser, and antivirus tools are fully updated to block malicious scripts from unauthorized streaming sites.

Major streaming networks have invested billions of Reais into producing exclusive Brazilian series, movies, and documentaries. From gritty crime dramas set in São Paulo to romantic comedies based in Rio de Janeiro, exclusive local productions are major subscriber magnets. 2. Subscription Fan Platforms

: Experience the world's most famous street party, particularly in Rio or Salvador Learn Samba and Capoeira

: One of the world's most spectacular waterfall systems, located on the border with Argentina. The Amazon Rainforest

Subscribers enjoy exclusive red-carpet footage, intimate celebrity interviews, and unedited event clips from major media galas worldwide. Tracking Popular Media and Viral Trends

: Short-form vertical video remains the default for engagement, especially on platforms like TikTok , which reached over 131 million Brazilian users aged 18+ by the end of 2025.

: A vast open-access database containing thousands of exclusive scientific articles from Brazilian researchers across all fields. 💡 Search Tips

However, the Brazilian market is unique. Its users are not passive consumers; they are active, demanding participants. A landmark 2025-2026 study on consumer behavior in the country revealed that the public has moved away from generic searches, instead seeking highly specific and personalized experiences. This has led to a fragmented market where regional preferences heavily influence consumption patterns. For instance, states in the North and Northeast, like , tend to lead in searches for direct, amateur-style videos, while the Southeast (São Paulo and Rio de Janeiro) shows a more diverse appetite for specific fetishes and categories.

: The undisputed local king. It leverages the massive archive of Rede Globo. It creates exclusive spin-offs, gritty crime dramas, and early-access telenovelas.

Below is a comprehensive analysis of the exclusive video content market in Brazil, how these videos spread globally, and how users can safely navigate online media platforms. Major Categories of Exclusive Brazilian Video Content

To help tailor this analysis further, could you provide more context on the you are targeting? If you are looking to build a digital marketing campaign, Share public link

: Local influencers build massive, loyal communities. They provide exclusive, behind-the-scenes glimpses into their daily lives. 4. Key Trends Shaping the Future of Brazilian Media

Brazil’s legal approach also extends to new forms of content. For instance, the Ministry of Justice has implemented a content classification system that rates internet applications based on factors such as violence, sex/nudity, drugs, and interactivity. Several laws (PL 3902/2023, PL 6211/2023, PL 2394/2023) specifically criminalize the creation and distribution of fake pornographic content, especially content involving minors.

Some other things!

Descriptive content, continous updates, and soundbites from industry professionals.

Descriptive, not prescriptive

When explaining content, we follow a descriptive approach, not prescriptive. In other words, we don’t tell you what specific tools or libraries you have to use to be successful. Rather, we focus on explaining a concept and employ certain libraries or tools to illustrate that concept.

React-focused with universal concepts

While the book is React-focused, it teaches universal concepts that transcend all web development frameworks. It's designed to enhance your understanding of building web applications that are scalable, maintainable, and adaptable, regardless of the specific technology stack.

Continous, frequent updates

Purchasing the e-book gives you access to all new content, edits, and improvements forever. In fact, we're currently working on adding three new chapters soon — Routing, User-centric API design, and React in 2024. Check out the Changelog to follow along on all the updates we'll make.

Soundbites from industry professionals

In the book, we share soundbites and thoughts from industry professionals. These soundbites are shared from start-up owners and software engineers who work at Doordash, Netflix, Spotify, and more.

Back cover of physical book

Front cover of physical book

Back cover of physical book

Contents of physical book

Industry nuggets

Nuggets of wisdom from industry professionals

Jem Young

Maxi Ferreira

Emma Bostian

Zeno Rocha

Francine Navarro

Jeffrey Peng

And others!

Xxxx Videis Barsil Exclusive Link

The world of exclusive video content in Brazil operates within a complex and evolving legal framework. The country is actively working to protect intellectual property and regulate streaming services. Law No. 14.815/2024 grants Brazil's National Film Agency (ANCINE) significant new powers to combat online piracy, allowing it to block illegal content without long court proceedings. This law gives ANCINE the authority to work directly with internet providers to block pirate websites, a move designed to protect the rights of content creators across all audiovisual media.

Raw, eyewitness video footage of major weather events, political rallies, or regional news stories often surfaces first on local networks before gaining international attention. Navigating Search Terms and Typographical Variations

Audience and creator effects:

Exclusive video content—videos available only on a single platform, channel, or through a paid access model—has grown rapidly in Brazil over the past decade. Several forces drive this trend:

Exclusivity has allowed local creators to bypass traditional media gatekeepers. Producers and models from São Paulo, Rio de Janeiro, Belo Horizonte, and beyond can now shoot, edit, and distribute their own video libraries. This direct-to-consumer model ensures that the content remains highly authentic, safe, and tailored exactly to what the domestic audience desires. xxxx videis barsil exclusive

: Best for live exclusive events and interactive creator content.

Ensure your operating system, browser, and antivirus tools are fully updated to block malicious scripts from unauthorized streaming sites.

Major streaming networks have invested billions of Reais into producing exclusive Brazilian series, movies, and documentaries. From gritty crime dramas set in São Paulo to romantic comedies based in Rio de Janeiro, exclusive local productions are major subscriber magnets. 2. Subscription Fan Platforms

: Experience the world's most famous street party, particularly in Rio or Salvador Learn Samba and Capoeira The world of exclusive video content in Brazil

: One of the world's most spectacular waterfall systems, located on the border with Argentina. The Amazon Rainforest

Subscribers enjoy exclusive red-carpet footage, intimate celebrity interviews, and unedited event clips from major media galas worldwide. Tracking Popular Media and Viral Trends

: Short-form vertical video remains the default for engagement, especially on platforms like TikTok , which reached over 131 million Brazilian users aged 18+ by the end of 2025.

: A vast open-access database containing thousands of exclusive scientific articles from Brazilian researchers across all fields. 💡 Search Tips and interactivity. Several laws (PL 3902/2023

However, the Brazilian market is unique. Its users are not passive consumers; they are active, demanding participants. A landmark 2025-2026 study on consumer behavior in the country revealed that the public has moved away from generic searches, instead seeking highly specific and personalized experiences. This has led to a fragmented market where regional preferences heavily influence consumption patterns. For instance, states in the North and Northeast, like , tend to lead in searches for direct, amateur-style videos, while the Southeast (São Paulo and Rio de Janeiro) shows a more diverse appetite for specific fetishes and categories.

: The undisputed local king. It leverages the massive archive of Rede Globo. It creates exclusive spin-offs, gritty crime dramas, and early-access telenovelas.

Below is a comprehensive analysis of the exclusive video content market in Brazil, how these videos spread globally, and how users can safely navigate online media platforms. Major Categories of Exclusive Brazilian Video Content

To help tailor this analysis further, could you provide more context on the you are targeting? If you are looking to build a digital marketing campaign, Share public link

: Local influencers build massive, loyal communities. They provide exclusive, behind-the-scenes glimpses into their daily lives. 4. Key Trends Shaping the Future of Brazilian Media

Brazil’s legal approach also extends to new forms of content. For instance, the Ministry of Justice has implemented a content classification system that rates internet applications based on factors such as violence, sex/nudity, drugs, and interactivity. Several laws (PL 3902/2023, PL 6211/2023, PL 2394/2023) specifically criminalize the creation and distribution of fake pornographic content, especially content involving minors.

Who we are

Heyo! We're Addy & Hassan — Engineers & Educators.

AddyOsmani

I'm an engineering leader working on Google Chrome and I lead up Chrome's Developer Experience organization, helping reduce the friction for developers to build great user experiences.

HassanDjirdeh

I'm a senior software engineer and have built large production web applications at organizations like Doordash, Instacart, and Shopify.

Pick your package

“Building Large Scale Web Apps” is available in either an e-book or as a physical copy.

E-book

Great for digital learners.

$24.99_USD

300+ pages
PDF or EPub (or both)
All future updates

Buy with Leanpub Or buy with Apple Books or Google Play

Physical copy (softcover)

Perfect for hands-on referencers.

$49.99_USD

300+ pages
Softcover
Something to put on your bookshelf
Interested in both the e-book and physical copy? Purchase both separately!

Buy Physical Copy

Some words from readers

Here are some things we've been hearing from our readers.

- My current weekend read. This is exactly what I've been looking for.
  Artem Mezentsev
  Software Developer @ Flaire
- I was thrilled to purchase the book on release day and it far exceeded my expectations.
  Anurag Chouksey
  Tech Leadership @ Thrive Market
- A great read that provides an abundance of material for planning and developing large-scale websites.
  Abdulraoof Aldabil
  Senior Frontend Engineer
- Absolute beast of a gem. Totally recommend for all frontend developers!
  Totally recommend for all frontend developers!
  Prosper Otemuyiwa
  CTO @ Eden Life
- I’m absolutely loving the book so far. I can already tell this is going to be one of my favorite reads of the year.
  Maxi Ferreira
  Staff SWE @ HelpScout
- Very insightful book. Have recommended it to a lot of developers in my circle.
  Brunel Johnson
  Fullstack Developer

FAQ

Got questions? We've got answers.

: You don't need to be a React expert but we assume you know the basics of React. With that said, we spend as much time as we can to introduce and explain concepts in as much detail as possible so if you're new to React, no need to worry!

: The book has 16 chapters totaling about 300+ pages. This will grow as we add more content and new chapters over time.

: The book is currently available in Epub, PDF, and Softcover format.

: Yes! The book is complete, though we will still make updates and add new and up-to-date content over time.

: Yes! You can track the updates we make in the /changelog page.

: You'll uncover strategies that industry professionals use to build maintainable and scalable React applications. You'll cover concepts like data fetching, client-side state management, design systems, A/B testing, TypeScript and a lot more. Check out the full table of contents for more details.

: Absolutely. to get a sample chapter right in your inbox.

: We are aiming to make the book available globally in as many formats and platforms as possible. At this time, while the book is not available on Amazon, we do make it available to buy from LeanPub which does have a guide for getting LeanPub books onto your Kindle device.

We may make the book available on Amazon in the future and if we do, will be sure to share it on the . We have not authorized third-party sellers to sell the book on Amazon so be sure to check you aren't purchasing a low-quality pirate copy from there :)

: We think that PPP is awesome for making books globally available to countries where purchase power is slightly less strong than in the US, Canada or parts of Europe.

If you would like to request PPP consideration for a purchase, please complete this form and we'll circle back to you after the initial launch.

: Our primary eBook platform (LeanPub) should work globally for digital purchases. For physical book purchases, our provider Lulu, is available globally across a number of continents. That said, it's possible that your country or region is not one that they currently deliver to.

If this is the case, hold tight and continue to watch our . We are evaluating options for more global delivery of the book and will share more once they're available.

: Yes absolutely. Some of the distribution we've done automatically distributed the e-book through Lulu and Amazon. However, when it comes to purchasing the e-book, we recommend purchasing through Leanpub (or Apple Books/Google Play).

If you've purchased an e-book format where the formatting doesn't match what you're looking for (or you've received only an ePub or PDF and not the other), reach out to either of us and we'll sort you out!