This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior AI Engineer based in Brazil. We are looking for an experienced AI Engineer to help build and enhance an AI-powered media planning platform. In this role, you will design, develop, and evaluate intelligent agents powered by Large Language Models (LLMs), leveraging Python, AWS Bedrock, and modern AI technologies. You will focus on improving agent reliability, accuracy, security, and performance through robust evaluation frameworks, intelligent workflows, and effective validation mechanisms. Working closely with engineering and product teams, you will contribute to scalable, production-ready AI solutions. This remote opportunity offers the chance to solve complex AI challenges, optimize real-world applications, and make a measurable impact on the quality and efficiency of AI-driven products.