[Job- 32285] Senior AI Engineer, Brazil

At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions. With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy. We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day. We are looking for an experienced AI Engineer to join our nearshore team working on an AI-powered media planning platform. In this role, you will focus on developing, evaluating, and improving intelligent AI agents powered by Large Language Models (LLMs). You will work with AWS Bedrock and modern AI technologies to build reliable agentic workflows, optimize agent behavior, implement evaluation frameworks, and ensure AI-generated outputs are accurate, secure, and consistent. Your work will directly impact the quality, reliability, and scalability of production AI solutions. Responsibilities: Design, develop, and maintain AI agents and LLM-powered applications using Python and AWS services. Implement and optimize prompt engineering, agent orchestration, and intelligent decision-making workflows. Develop evaluation frameworks to measure agent accuracy, reliability, and behavioral consistency. Establish performance baselines, automated tests, and regression validation for changes to agent behavior. Implement guardrails and validation mechanisms to ensure safe and reliable AI-generated outputs. Develop intelligent information retrieval, filtering, ranking, and selection strategies using LLMs. Investigate and resolve issues related to hallucinations, incorrect interpretations, and inconsistent agent responses. Build end-to-end AI features integrating LLMs with backend APIs, document processing, and cloud infrastructure. Improve agent observability through execution tracing, session tracking, and production monitoring. Collaborate with engineering and product teams to deliver scalable, production-ready AI solutions. Optimize LLM performance, latency, and operational costs through experimentation and measurable improvements. Requirements: Solid professional experience in AI engineering, machine learning engineering, or software development with production AI applications. Strong proficiency in Python and experience developing APIs, integrations, and automated tests. Hands-on experience building applications using Large Language Models (LLMs) and agentic AI workflows. Experience with prompt engineering, LLM orchestration, and structured output generation. Experience evaluating LLM outputs, implementing testing strategies, and measuring AI application quality. Understanding of LLM limitations, including hallucinations, response variability, and reliability challenges. Experience with AWS services (Bedrock, Lambda, S3, CloudWatch, or similar). Strong knowledge of software engineering best practices, CI/CD, and cloud-based application development. Strong analytical and problem-solving skills with the ability to troubleshoot complex agent behavior. Advanced or fluent English communication skills (both written and verbal) are essential for collaboration in a remote environment. #LI-LO1 Our benefits: Health and dental insurance Meal and food allowance Childcare assistance Extended paternity leave Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass; Profit Sharing and Results Participation (PLR); Life insurance Continuous learning platform (CI&T University); Discount club Free online platform dedicated to physical, mental, and overall well-being Pregnancy and responsible parenting course Partnerships with online learning platforms Language learning platform And many more! More details about our benefits here: https://ciandt.com/br/pt-br/carreiras At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here.This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it. We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.