Senior Frontend Developer (React), Brazil

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