Company specialized
in JavaScript

NextAge builds software in JavaScript and provides specialized teams with predictable delivery and data-driven management. Less rework, more control over your roadmap.

+19 years of experience

+600 companies served

+150 professionals

+13 countries

What does a JavaScript
development company deliver?

See the types of projects NextAge delivers with a dedicated squad, fixed scope and guaranteed SLA. Understand when JavaScript is the most solid technical choice for your roadmap.

Front-end development

JavaScript is the foundation of virtually every modern web interface, from e-commerce to corporate dashboards. NextAge builds fast, accessible, component-based interfaces, with a front-end architecture designed to scale without piling up technical debt.

Technologies: React, Next.js, Angular, Vue.js, TypeScript, Redux, Tailwind CSS

Back-end development with Node.js

Node.js makes it possible to use JavaScript on the server as well, with high performance in applications that handle many simultaneous requests. NextAge designs scalable, well-structured back-ends for web and mobile applications, with typed, tested code ready to grow with the business.

Technologies: Node.js, NestJS, Express, Fastify, TypeScript, PostgreSQL, MongoDB, Redis

API creation and integration

REST and GraphQL APIs built in JavaScript for integration between systems, communication with third-party services and secure data exposure. NextAge ensures proper versioning, robust authentication, clear documentation and consistent performance in every endpoint delivered.

Technologies: NestJS, Express, GraphQL (Apollo), Swagger/OpenAPI, OAuth2, JWT, API Gateway

Mobile and cross-platform applications

With JavaScript, iOS and Android apps can be built from a single codebase, reducing cost and delivery time. NextAge delivers apps with near-native performance, a consistent experience across platforms and simplified maintenance.

Technologies: React Native, Expo, TypeScript, Ionic, Electron

Real-time applications

JavaScript and Node.js are ideal for systems that require instant communication, such as chats, live dashboards, notifications and tracking. NextAge builds event-driven architectures that keep data in sync between users and systems with low latency and high availability.

Technologies: WebSocket, Socket.IO, Node.js, Redis Pub/Sub, Apache Kafka, RabbitMQ

Legacy application modernization

Applications built with AngularJS, jQuery or untyped JavaScript can be migrated to modern architectures without interrupting operations. NextAge performs framework migration, TypeScript adoption, incremental refactoring and test coverage, with controlled risk and full predictability.

Technologies: Migration to React/Angular/Vue.js, TypeScript, Jest, Cypress, Docker, cloud migration

… and whatever else it takes for your digital transformation to happen now.

NextAge + JavaScript solutions

Proprietary methodologies and specialized services to maximize results in your JavaScript projects

Staff Augmentation

Allocation of specialist JavaScript teams. Unlike the traditional model, you get senior developers, JavaScript architects, tech leads and QAs focused on automated testing, all managed by us. We guarantee continuous code review and JavaScript architecture standards.

Choose it to scale JavaScript teams without the risks of traditional staffing

Java.NET / C#JavaScriptTypeScriptPythonRubyPHPGoKotlinSwift

Spring BootDjangoFlaskFastAPIRuby on RailsLaravelReact.jsAngularVue.jsNode.js

NextAge specialist ready to talk about your JavaScript project

Get the best JavaScript
developers on your project

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Hundreds of IT projects delivered

We have a solid project portfolio. Everything you need for software at the highest technical and strategic level.

Boost Customer Lifetime Value with AI Agents

Brazilian telecom operator with 67 million customers.

Challenge

In telecom, retaining customers is far cheaper than acquiring new ones. The company couldn't scale due to manual campaigns, lack of real-time data, and mistimed outreach that were pushing costs up and customer satisfaction down.

Solution

NextAge transformed raw data into meaningful customer relationships. We developed an AI agent platform that created personalized campaigns and journeys tailored to each customer, combining discounts, cross-selling, and cashback to drive maximum value.

Results

+6,7%

in revenue and retention

+12%

in satisfaction and engagement

-37%

in marketing costs

Want results like these in your company?

What sets our JavaScript
developers apart?

→ The differentials that made NextAge the number 1 choice of market leaders

Validated professionals

Our team is rigorously trained and validated before joining the project. You work with professionals who have already solved complex problems similar to yours.

Learning curve

Unlike traditional staffing, our teams are actively managed by us. Tech leads monitor developer performance and alignment with your goals, accelerating the learning curve.

Quality and testing culture

AI-powered automated testing, code review and CI/CD are part of our DNA. We deliver tested, production-ready code, reducing bugs and rework.

More agility

We adopt truly agile methodologies. Well-planned sprints, incremental deliveries and transparent communication. You follow progress in real time.

Knowledge as a foundation

Our JavaScript developers also have experience with databases (PostgreSQL, MongoDB, Redis), cloud (AWS, Azure), DevOps (Docker, CI/CD) and automated testing. Command from front-end to back-end, with a complete view of the ecosystem.

Cultural alignment

Our teams understand the context and culture of companies. Clear communication, productive meetings and natural alignment with technical and business stakeholders.

// ABOUT

Why NextAge?

Learn our story →

Founded in 2007, NextAge was born to make software development more disruptive, human, and effective.

Innovation has always been at our core. We revolutionized the technology market with Staff Augmentation, our exclusive methodology that brings up to 40% more productivity to teams.

And we didn't stop there! We went further with NextFlow AI, a new way of developing that combines AI and human expertise in every line of code.

Today, we are the partner that transforms complexity into clarity and accelerates your operation with the best talent.

Learn more →

Want to understand more about how NextAge can help your business? Explore articles from our blog, testimonials from our clients and our other services to carry out your digital transformation in the best way.

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Questions and answers

When is it worth using JavaScript on the back-end with Node.js?

Node.js is a good fit for applications with many simultaneous requests and input/output operations, such as APIs, real-time systems, marketplaces and SaaS platforms. An added advantage is using the same language on the front-end and back-end, which shortens the learning curve and makes it easier to share code between layers. For heavy CPU processing, such as scientific calculations or large-scale image processing, other languages tend to be more efficient.

Is JavaScript secure for enterprise applications?

Yes, as long as the application follows security best practices from the architecture stage. This includes robust authentication (OAuth2, JWT), input validation, protection against attacks such as XSS and injection, dependency auditing and continuous package updates. At NextAge, these criteria are part of the definition of done for every delivery, not a separate step at the end of the project.

What is the difference between JavaScript and TypeScript, and which should enterprise projects use?

TypeScript is an extension of JavaScript that adds static typing, making it possible to catch errors during development, before they reach production. For enterprise projects, with large teams and long-term maintenance, TypeScript is the recommended choice because it makes code more readable, predictable and easier to refactor. The end result is still JavaScript, compatible with any browser or Node.js environment.

React, Angular or Vue.js: which framework should an enterprise application use?

The choice depends on the project context. React has the largest ecosystem and talent pool, and is a good fit for complex interfaces and fast-evolving products. Angular offers a more opinionated and complete structure, suited to large enterprise systems with big teams. Vue.js has a gentler learning curve and is efficient for mid-sized projects or gradual migrations. NextAge recommends the framework based on criteria such as team size, product roadmap and availability of professionals on the market.

Is Node.js scalable for high-traffic applications?

Yes. Node.js uses an asynchronous, non-blocking model that can handle thousands of simultaneous connections with low resource consumption. Real scalability, however, depends on the architecture: microservices, caching with Redis, message queues, load balancing and containerization. Major global streaming, e-commerce and payment platforms run Node.js in production.

Is it worth using React Native instead of native development?

For most enterprise and business applications, yes. React Native makes it possible to build for iOS and Android from a single codebase, which reduces cost, time and maintenance effort, with near-native performance. Native development remains the better fit for apps that make intensive use of hardware, such as 3D games or advanced camera processing.

How can a legacy AngularJS or jQuery application be modernized without interrupting operations?

The safest approach is incremental migration, in which parts of the application are gradually rewritten and replaced while the system keeps running. The process usually includes mapping the existing code, creating automated tests to protect business rules, adopting TypeScript and replacing the system module by module. NextAge runs this type of project with a reference scope and tracking metrics, so managers have visibility into progress and risk at every stage.

What are the advantages of a full-stack JavaScript team over separate front-end and back-end teams?

With JavaScript and TypeScript on both layers, the same team can build the interface, APIs and business rules, which reduces dependencies between teams, speeds up delivery and makes it easier to share code, such as validations and types. It also simplifies management, because there are fewer context switches and fewer communication failure points. At NextAge, full-stack JavaScript teams are structured under the Staff Augmentation model, with full-time employees and delivery metrics that ensure project continuity.

How can code quality be ensured in JavaScript projects?

Quality in JavaScript depends on a combination of practices: typing with TypeScript, automated testing (unit, integration and end-to-end, with tools such as Jest and Cypress), code review, standardization with linters and CI/CD pipelines that block faulty deliveries. NextAge complements these practices with the NextFlow AI methodology, which uses artificial intelligence to monitor delivery quality and reduce rework by up to 90%.

Can artificial intelligence be integrated into JavaScript applications?

Yes. The JavaScript ecosystem has mature libraries for integrating with large language models (LLMs), such as LangChain.js and the Vercel AI SDK, as well as official SDKs from the main AI providers. With them, web, mobile and Node.js applications can gain features such as virtual assistants, semantic search, process automation and predictive analytics.

Company specialized
in JavaScript

What does a JavaScript
development company deliver?