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
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.

Work arrangement
Yes