RN 42 IT Services

At RN42 IT Services, we combine over 7 years of hands-on expertise to deliver modern, high-quality software that empowers businesses across sectors like fintech, healthcare, e-commerce, and B2B platforms.

We help our clients build, scale, and maintain web and mobile applications through a focus on clean architecture, performance optimization, and exceptional user experience.

🌐 Frontend Development

• React.js & Next.js Applications:

  • Development of modern SPAs and SSR websites with a strong focus on performance, SEO, and maintainability.

  • Expertise in Tailwind CSS, Styled Components, CVA, and Storybook.

  • Integration with REST and GraphQL APIs.

  • Implementation of atomic and reusable components.

• React Native Mobile Apps:

  • Cross-platform apps for iOS and Android, leveraging React Native, Expo, and advanced state management (Redux, Redux Saga, RTK Query).

  • Integration of Google Maps, geolocation, and offline-first capabilities.

  • Build processes for APK/IPA deployment, OTA updates, and CI/CD pipelines.

🛠️ Backend Development

• Python & Node.js Services:

  • RESTful APIs and microservices using FastAPI, Django, and NestJS.

  • High-performance data workflows and integrations across multiple data sources (e.g., PagSeguro’s B2B ecosystem).

  • Use of OpenAPI for clear contract definitions between frontend and backend.

  • Docker containerization for scalable deployments.

✅ Testing & Quality Assurance

• Unit and Integration Testing:

  • Using Jest, Cypress, Vitest, and React Testing Library.

• Code Quality:

  • Static analysis and monitoring with SonarQube.

  • Emphasis on Clean Code principles and design patterns.

💡 UX-Driven Development

• Design Implementation:

  • Transforming Figma designs into pixel-perfect, accessible interfaces.

• User-Centric Flows:

  • Examples like the Lia Example, where frictionless OTP flows were designed for elderly users.

  • Collaborative wireframing practices (Trek Design) to align expectations when design sprints were not available.