Job Summary: The Senior Software Engineer at Mercado Livre 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 proprietary AI models. 3. Contribute to the technical growth of the team and the system. As a **Senior** **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 with cutting-edge technology, applying engineering best practices, proprietary AI models, and continuous learning—all to democratize e-commerce and financial services across Latin America. Imagine yourself leading challenging, dynamic, and innovative projects—and being responsible for: * Analyzing and developing new features for voice interaction services, including real-time, unidirectional, and bidirectional communications integrated into the Mercado Livre ecosystem. * Defining, in partnership with specialized teams, the architecture and development of scalable and resilient services. * Maintaining production systems, supporting customer support teams in bug resolution. * Supporting developers in adopting and using the platform. * Contributing to the technical growth of the team and the system—raising the bar for code quality and development methodologies—and ensuring application stability and scalability. * Identifying user needs and proposing tool enhancements. **What we’re looking for?** * Experience with Java, APIs, microservices architectures, and distributed systems. * Python knowledge is a plus. * Experience with relational and NoSQL databases. * Knowledge of system architecture in general, solid expertise in cloud-based and microservices architectures. * In-depth knowledge of observability and monitoring tools: DataDog, NewRelic, and Grafana. **Are you excited to leave your mark on Latin American technology?** Apply now and join our purpose! Hybrid work mode. Location: Osasco, São Paulo.