[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

Our benefits:   -Health and dental insurance -Meal and food allowance -Childcare assistance -Extended paternity leave -Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass; -Profit Sharing and Results Participation (PLR); -Life insurance -Continuous learning platform (CI&T University); -Discount club -Free online platform dedicated to physical, mental, and overall well-being -Pregnancy and responsible parenting course -Partnerships with online learning platforms -Language learning platform And many more!   More details about our benefits here: https://ciandt.com/br/pt-br/carreiras   At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here.This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it.   We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.