As a **Senior** **Backend 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 engineering best practices, proprietary AI models, and continuous learning—all with the purpose of democratizing e-commerce and financial services across Latin America. Imagine yourself leading challenging, dynamic, and innovative projects, and **being responsible for**: * Contributing to the design and development of products that directly impact the lives of thousands of people every day. * Developing initiatives using diverse technologies. * Participating in team development by actively debating—using sound technical arguments—specific techniques, tools, and methodologies. * Collaborating on architectural decisions, always prioritizing scalable solutions. * Monitoring and creating quality KPIs, alerts, and traceability to ensure our product’s quality. **What are we looking for in you?** * Solid expertise in Java (Spring, Spring Data, JPQL/Native Queries, Feign, Maven/Gradle, Generics, Threads, Streams, and Exception Handling); Golang and Kotlin are desirable. * Understanding of software architecture (Microservices, Onion, Clean Architecture, MVC, Event-Driven), SOLID principles. * Application of secure development and Websec best practices and knowledge. * Conducting tests (JUnit Unit Tests, Integration Tests, Load Tests, TDD, and BDD). * Advanced/expert-level proficiency in Performance/Observability/Logs (DataDog, Kibana, New Relic, Grafana). * Demonstrated excellence in collaborating with partner/cross-functional teams (from product conception/discovery with UX, through technical solution definition, to production delivery). **Are you excited to leave your mark on Latin America’s technology landscape?** Apply now and join our mission! Hybrid work model. Office: São Paulo.