[Job - 32565] AI Engineer Senior, Brazil

ResumeXrays LLC; Brasil; On-site; BRL 180,000 - 320,000; Full time

Benefits offered by this job

Health and dental insurance

Meal and food allowance

Childcare assistance

Extended paternity leave

Profit Sharing and Results (PLR)

Life insurance

CI&T University learning platform

Discount club

Well-being platform

Language learning platform

Job summary

CI&T is seeking a skilled software engineer to build and maintain core SDK components for AI agents, including memory, prompts, and interfaces. You will work across agent frameworks, server templates, and AWS-backed services to deliver production-grade solutions.

You will collaborate with global teams to onboard use-case partners, debug agents, and contribute to platform improvements. A strong emphasis on Python, FastAPI, async, and testing underpins this role.

Qualifications

• Advanced English proficiency (C1+), with autonomy to communicate with international stakeholders.
• Extensive years of software engineering, with strong Python: FastAPI or similar, async, packaging, testing.
• 1+ year building LLM-powered applications or agents that reached real users (pilot or production).
• Experience with tool calling, prompt design and handling model failures.
• Familiarity with at least one agent framework (Strands, LangGraph, Claude Agent SDK, OpenAI Agents SDK, CrewAI, LlamaIndex).
• AWS experience: Lambda, ECS/Fargate, IAM, S3, DynamoDB, and Bedrock or SageMaker.
• Experience with RAG: embeddings, vector stores, chunking and retrieval tuning.
• CI/CD, containers (Docker) and infrastructure-as-code (Terraform preferred).

Responsibilities

• Build SDK features and framework adapters, including memory, prompts, and evaluation hooks.
• Build and maintain agent and MCP server templates for runtime and ECS Fargate over HTTP and A2A.
• Integrate with the AWS Agent Registry: registration, approval flow, identity-scoped discovery.
• Write contract and integration tests.
• Keep the release parity gate green.
• Help use-case teams onboard, debug agents, and feed learnings back to the platform.
• Take part in on-call or office hours, and in RCAs.

Skills

Python

FastAPI

Async programming

Unit testing

LLM apps

Tool calling

Agent frameworks

AWS Lambda

CI/CD

Docker

Tools

Strands

Claude Agent SDK

LangGraph

Bedrock

OpenSearch

Redis

Terraform

Job description

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.

You will build and maintain the core components teams use to ship agents: the Python SDK, agent and MCP templates, memory and context services, the agent registry integration and the FastAPI entry layer. You will often own one component end to end, as primary support.

Responsibilities:

• Build SDK features and framework adapters (Strands, Claude Agent SDK, LangGraph), including memory (AgentCore Memory short- and long-term, Redis), skills, prompt management integration, and evaluation hooks.
• Build and maintain agent and MCP server templates for AgentCore Runtime and ECS Fargate, over HTTP and A2A.
• Integrate with the AWS Agent Registry: registration, approval flow, identity-scoped discovery. Build and support RAG and knowledge services (Bedrock Knowledge Bases, OpenSearch vector, ingestion pipelines).
• Write contract and integration tests.
• Keep the release parity gate green.
• Help use-case teams onboard, debug their agents, and feed what you learn back into the platform.
• Take part in on-call or office hours, and in RCAs.

Requirements:

• Advanced English proficiency (C1 or above), with autonomy to communicate directly with international stakeholders
• Extensive years of experience in software engineering, with strong Python: FastAPI or similar, async, packaging, testing.
• 1+ year building LLM-powered applications or agents that reached real users (pilot or production).
• Experience with tool calling, prompt design and handling model failures.
• Familiarity with at least one agent framework (Strands, LangGraph, Claude Agent SDK, OpenAI Agents SDK, CrewAI, LlamaIndex).
• AWS experience: Lambda, ECS/Fargate, IAM, S3, DynamoDB, and Bedrock or SageMaker.
• Experience with RAG: embeddings, vector stores, chunking and retrieval tuning.
• Comfortable with CI/CD, containers (Docker) and infrastructure-as-code (Terraform preferred). Preferred Bedrock AgentCore (Runtime, Harness, Gateway, Memory, Identity, Code Interpreter). MCP server development.
• A2A protocol. Redis/ElastiCache, OpenSearch. Langfuse or similar LLM observability, prompt management and evaluation tools.
• Experience writing internal developer documentation and samples (notebooks, quick starts).

Nice to Have:

• AWS certifications and recent study/project history in agent technology will be accepted in lieu of multiple years of hands-on experience.

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.