[Job-32363] Senior Frontend Developer (React), Brazil

At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions.

With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy.

We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day.

We’re looking for a Senior Frontend Developer to join a CI&T squad working on a financial services client. You’ll help move an established Java-based web application onto a modern React frontend: analysing legacy pages, turning them into a well-structured component library, and building fast, accessible user interfaces. You’ll work closely with backend developers, UX/UI designers, QA and the Product Owner.

**What you’ll do**

• Build and maintain responsive, accessible user interfaces with React and TypeScript
• Analyse legacy server-rendered pages and break them down into reusable React components
• Grow and maintain a shared component library based on shadcn/ui
• Connect the frontend to backend REST APIs: handle loading, error and empty states consistently
• Write unit and component tests with Vitest/Jest and React Testing Library
• Join refinement sessions: break features into tasks, estimate them and point out UX or technical risks
• Review pull requests and help keep frontend standards, performance and documentation in good shape
• Work with designers to turn designs into pixel-accurate, consistent interfaces

**What you need (must-have)**

• Around 5 years of professional frontend experience, with at least 3 years in React (hooks, context, composition patterns)
• Strong TypeScript, HTML5 and modern CSS skills
• Hands-on experience with Vite: project setup, environment configuration and build optimisation
• Experience with shadcn/ui and the tools beneath it, Tailwind CSS and Radix UI
• Solid automated testing skills with Vitest and/or Jest, ideally with React Testing Library
• Experience consuming REST APIs: authentication, error handling and pagination
• Good grounding in web accessibility (WCAG) and responsive design
• Experience with routing (e.g. React Router or TanStack Router) and form validation (e.g. Zod)
• Familiarity with linting and formatting (ESLint, Prettier), Git workflows and CI/CD pipelines
• Experience working in agile teams (Scrum or Kanban)
• Good English communication skills for working with international stakeholders

**Nice to have**

• Storybook, for documenting and developing components in isolation
• Zustand, for client-side state management
• TanStack Query, for server state, caching and data synchronisation
• TanStack Form, for complex, type-safe forms
• Analysing legacy pages (e.g. JSP, XSLT/XML-rendered or server-side templates) and restructuring them into React components
• End-to-end testing with Playwright or Cypress
• Design systems and design tokens, and working from Figma
• Frontend performance work: Core Web Vitals, code splitting and lazy loading
• Basic understanding of Java web backends and how they serve and secure the frontend
• Experience in banking or other regulated environments

#LI-GP1