Job Summary: We are looking for a passionate Mid-level Front-end Developer committed to technology and transformation, with experience in JavaScript ES6+, TypeScript, and modern frameworks. Key Highlights: 1. Flexible working hours and a collaborative, innovative culture. 2. Opportunities for growth and development in cutting-edge technology. 3. Working with generative AI and continent-scale impact projects. **WHAT DOES IT MEAN TO BE A MUTANT?** **When you choose to become a Mutant, you choose to take a different step in your life and career.** Being a Mutant means joining a group courageous enough to blaze new trails and ambitious enough to go further every day. We are not the trendiest company — nor do we aim to be. Instead, we consistently deliver far more than we promise. And we prefer doing it as a team, because here it’s all for everyone and by everyone. We’re always seeking talented, passionate people to grow and evolve with us. If you believe in your talent and can demonstrate it in practice, come join us as a Mutant. We’re waiting for you. **Responsibilities and Duties** • Solid experience with JavaScript ES6\+ and TypeScript. * Proficiency in SPA concepts, componentization, immutability, functional programming, and code organization. * Knowledge of front-end architecture best practices (separation of concerns, SOLID adapted to FE, Clean Code). **Requirements and Qualifications** We seek a Mid-level Front-end Developer with solid experience building modern, scalable, and high-performance applications. **Frameworks and Ecosystem** * Experience with Vue (2 and 3\) and/or React 18\+ * Hooks, Composition API, componentization, and modular architecture * State management using Pinia, Vuex, or Context API * React Router or Vue Router * Experience with TanStack Query (React/Vue Query) for server-state management **API Consumption and Integrations** * Integration with REST APIs * Use of Axios or Fetch * Authentication via JWT/OAuth2 * Global error handling and caching strategies * Integration with multiple backend services (BFF is a plus) **UI, Styling, and Experience** * TailwindCSS, Sass, or CSS Modules * Experience with libraries such as MUI, Ant Design, Chakra, or similar * Creation of reusable components and Design Systems * Responsiveness (mobile-first) * Awareness of accessibility (WCAG/ARIA) and UX best practices **Architecture and Performance** * Organization by modules/domains * Lazy loading and code splitting * Performance optimization (memoization, reduction of re-renders, bundle optimization) * Experience with DevTools/Lighthouse **Quality, Testing, and Build** * Vite, Webpack, or similar * Unit testing with Jest or Vitest * E2E testing with Cypress or Playwright * ESLint, Prettier, and coding best practices **DevOps and Version Control** * Git (GitHub, GitLab, or Bitbucket) * CI/CD experience * Docker (desirable) * Package publishing and versioning (a plus) * Additional Advantages * SSR/SSG (Next or Nuxt) * Storybook * PWA * Front-end observability **Additional Information** **What you’ll find here:** * Flexible working hours; * Flat organizational structure; * Casual dress code; * Bike and scooter parking (for office visits); * Cross-brand growth opportunities; * Citizen Company: Our employees enjoy extended parental leave; **Benefits:** * Medical and dental insurance; * Life insurance; * Commuter allowance; * Meal and food vouchers; * Wellhub (Gympass); * Childcare allowance; * Allowance for children with disabilities; * Performance bonus; * Birthday day off; * Alelo Multibenefícios; * Allya — app-based partnerships and discounts; * Pet health plan; **In addition, we also include some benefits aligned with our Mutant purpose:** * Freedom to be who you are. Inclusion is in our DNA. We make no distinction based on gender, race, religion, or color! We are all Mutants! * People and experiences drive us. They are our essence and purpose. Initiatives and programs focused on climate, development, and culture; * Delivering value to people and businesses. Together, we build digital products that accelerate business growth.; * Being part of an outstanding team that plays together, collaborates, innovates, and transforms. And most importantly: enjoys the entire journey; * Working and exchanging daily knowledge. The industry’s top minds in one place where they can truly be themselves — that’s how we deliver disruptive solutions; We were born to transform. Not just a product, not just a process, **the entire game**. Our purpose is simple: **evolving the relationship between brands and people through technology, data, and creativity.** We solve real problems, at real scale: **\+70 million CPFs impacted annually** **\+10 billion voice and text interactions** **\+3.5 billion interactions powered by AI** Across multiple journeys. Across all channels. Every day. **Because the future is now.** **TECHNOLOGY BORN FROM PEOPLE** We pioneered the use of Generative AI to transform how companies communicate, engage, and solve problems with their customers. It’s not “just another AI”. We built our own ecosystem: **IAM, the Mutant Generative AI**, a multi-agent system that learns from every interaction, adapts to the client’s business, and delivers hyper-personalized experiences at scale. Technology is our foundation. But what truly sets us apart is **who builds this technology**: curious, restless people who challenge assumptions, think alongside others, and rethink what no one else has considered. **OPPORTUNITIES THAT EVOLVE YOU** We seek people who want to build, not just execute. People who keep pace with innovation and value working alongside the most advanced developments in AI, data, and customer experience. Here, you’ll find: * Continent-scale impact projects * Proprietary, multi-agent, cutting-edge technology * Continuous learning * Creative freedom with responsibility * Accelerated growth in a fast-moving market