Junior/Mid-Level Front-end Developer, React/React Native

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 web and mobile interfaces using React and React Native, with a strong focus on performance, user experience, and best practices in componentization. Proficient in JavaScript, TypeScript, and REST API integration within agile environments.

Highest-signal resume keywords

React Application DevelopmentReact Native Mobile DevelopmentJavaScript and TypeScript ProficiencyREST API IntegrationAutomated UI Testing

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

ReactReact NativeJavaScriptTypeScriptHTMLCSSReduxAutomated TestingComponentizationPerformance Optimization

Tools & Technologies

JestReact Testing LibraryScrumKanbanStyled ComponentsTailwind CSS

Industry Keywords

Responsive DesignUser ExperienceAgile MethodologiesFront-end SolutionsCross-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 related to the architecture and evolution of Front-end solutions
Develop responsive, 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
Strong knowledge of HTML and CSS
Experience developing modern, responsive, 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 with best practices for componentization and interface development
Knowledge of automated testing, such as Jest and React Testing Library or similar tools
Experience working in agile environments and methodologies, such as Scrum or Kanban
Nice to have: Knowledge of Styled Components
Nice to have: Knowledge of Tailwind CSS
Nice to have: Experience optimizing performance in web and mobile applications
Nice to have: 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