As a **Senior Software Engineer** at Mercado Livre, you will design and scale innovative and secure systems that solve real, high-impact problems. You'll work in a dynamic environment with cutting-edge technology, applying engineering best practices, proprietary AI models, and continuous learning, with the purpose of democratizing e-commerce and financial services in Latin America. Imagine\-yourself leading challenging, dynamic, and innovative projects and **being responsible for**: * Participating in all phases of high-impact product development, analyzing requirements and proposing solutions that add value to both technical and business areas. * Collaborating in the definition of architecture and scalability of our products. * Ensuring code quality by using best practices such as code reviews, pair programming, etc. * Building and executing tests for applications. * Monitoring application performance metrics as well as product/business metrics. * Supporting mentorship and development of less senior developers, actively contributing to their growth. **What we look for in you?** * Experience with Golang or Java. * Experience managing relational and NoSQL databases. * Experience working in cloud environments, developing distributed systems with medium\-high complexity flows. * Experience in monitoring and observability. * Experience translating business requirements into scalable technical solutions. **Are you excited to leave your mark on Latin America's technology landscape?** Apply now and join our mission! Hybrid work model. Location: Osasco \- São Paulo.