Job Summary: As a Front-end Software Engineer at Mercado Livre, you will design and scale innovative and secure systems, working in a dynamic environment with cutting-edge technology to democratize e-commerce and financial services. Key Highlights: 1. Design and scale innovative and secure systems 2. Work with cutting-edge technology and AI 3. Collaborate on challenging and dynamic projects As a **Front-end Software Engineer** at Mercado Livre, you will design and scale innovative and secure systems that solve real-world, high-impact problems. You will work in a dynamic environment leveraging cutting-edge technology, applying sound engineering practices, proprietary AI models, and continuous learning—all aimed at democratizing e-commerce and financial services across Latin America. Imagine yourself leading challenging, dynamic, and innovative projects and being responsible for: * Developing high-performance code, performing complex refactors, and conducting code reviews to ensure technical quality. * Designing resilient, modular user interfaces aligned with business objectives. * Implementing automated testing and observability strategies to ensure application reliability and performance. * Collaborating with Product and UX teams to define technical solutions focused on optimal user experience. * Defining front-end architectures using advanced patterns and secure development best practices. * Making data-driven decisions based on performance metrics to propose continuous product improvements. **What we’re looking for:** * Extensive experience in front-end development using JavaScript, TypeScript, Node.js, React, HTML, and CSS. * Solid understanding of semantic HTML and accessibility standards. * Mastery of various rendering techniques and their respective use cases for performance optimization. * Knowledge of unit and end-to-end test automation. * Experience with observability tools and platforms such as New Relic, Datadog, or Kibana. **Are you excited to leave your mark on Latin America’s technology landscape?** Apply now and join our mission! Work mode: Hybrid. Office location: Melicidade – SP.