Front-End Developer – React, React Native – Junior/Mid-Level

Sioux digital 1:1

. Plan and develop web and mobile interfaces, from understanding requirements through delivery .

Posted 9/25/2026contractSão Paulo • BrazilJuniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in developing responsive and high-performance web and mobile interfaces using React and React Native, with a strong focus on user experience and performance optimization. Proficient in implementing automated testing and collaborating in agile environments to deliver quality solutions.

Highest-signal resume keywords

React Application DevelopmentReact Native Mobile DevelopmentJavaScript and TypeScript ProficiencyREST API IntegrationAgile Methodologies (Scrum, Kanban)

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

ReactReact NativeJavaScriptTypeScriptHTMLCSSReduxAutomated Testing (Jest, React Testing Library)Performance OptimizationComponentization Best Practices

Tools & Technologies

Styled ComponentsTailwind CSS

Industry Keywords

Responsive DesignUser ExperienceFront-End ArchitectureAgile DevelopmentCross-Platform Applications

Tech Stack

Tools & technologies

JavaScriptJestReactReact NativeReduxTypeScript

About the role

Key responsibilities & impact

Plan and develop web and mobile interfaces, from understanding requirements through delivery
Develop components, screens, and features using React and React Native
Participate in decisions regarding the architecture and evolution of front-end solutions
Develop responsive and accessible interfaces focused on performance and user experience
Consume and integrate internal and external REST APIs
Collaborate with back-end teams and other technology departments
Implement automated UI tests, including unit and integration tests
Apply best practices for componentization, code organization, and code reuse
Keep technical documentation for components and solutions up to date
Participate in the planning and execution of projects in agile environments, such as Scrum and Kanban

Requirements

What you’ll need

Solid experience with React for web applications and React Native for mobile applications
Advanced proficiency in JavaScript and TypeScript
Solid knowledge of HTML and CSS
Experience developing modern, responsive, and high-performance web and mobile interfaces
Experience consuming and integrating REST APIs and back-end services
Knowledge of state management using Redux or similar solutions
Experience applying best practices for componentization and interface development
Knowledge of automated testing tools such as Jest and React Testing Library, or similar tools
Experience working in agile environments and methodologies, such as Scrum or Kanban
Knowledge of Styled Components
Knowledge of Tailwind CSS
Experience optimizing performance in web and mobile applications
Experience with the architecture and development of cross-platform applications

Benefits

Comp & perks

Amil health insurance
Amil dental insurance
Birthday day off
Paid vacation
TEM Saúde Program
Pharmacy discounts
Discounts on undergraduate, graduate, continuing education, and language courses