**We are looking for someone who dares to co-lead with us.** **Responsibilities and duties:** Working on a strategic project for modernizing and migrating legacy systems, with a focus on enhancing user experience, application scalability, and maintaining a cloud environment on Microsoft Azure. The professional will collaborate with multidisciplinary teams, supporting the technological transition in a structured and sustainable manner. **Requirements and qualifications:** * Solid experience as a Senior Front-End Developer. * Proficiency in React (Hooks, Context API, state management). * Experience with JavaScript (ES6+) / TypeScript. Knowledge of HTML5, CSS3, responsiveness, and UX/UI best practices. * Experience consuming REST APIs. * Experience with Azure DevOps, Git version control, and CI/CD pipelines. * Experience in legacy system migration or modernization projects. **Desirable:** * Experience with Micro Frontends. * Knowledge of front-end testing (Jest, Testing Library, Cypress). * Experience in large-scale corporate environments. * Knowledge of web application security and performance. * Prior experience in cloud projects (Azure). **Additional information:** * For your health, we offer **medical and dental assistance**, with no co-payment for exams and consultations. * Want more well-being? We offer **Gympass** and **Zenklub** (with two free sessions per month) so you can take care of your physical and mental health. * Love to travel? Here we have **Férias & Co**, a benefit that helps make your dream vacation possible. * Growing family? We offer **MomCare**, a flexible monetary incentive after maternity leave for new Datunian mothers. * Want to invest in your professional development? We partner with several renowned educational institutions to offer you discounts of up to 70% on **undergraduate**, **postgraduate**, **MBA**, **language**, and many other courses! **To learn about all our benefits, visit the homepage of our careers page.**