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.