CI&T

AI-driven digital solutions and nearshore development

AI Lead Software Engineer

AI Application Engineering +1Confirmed live in the last 24 hours

Full-timeRemote in BrazilNo salary listedRemote

About the Job

Requirements

Advanced English proficiency at C1 or above, with the autonomy to communicate directly with international stakeholders.
Extensive professional software engineering experience and experience leading teams.
Experience building libraries, software development kits, or platforms used by other engineering teams.
Expert Python skills, including asynchronous programming, typing, packaging, dependency management, and pytest at scale.
Hands-on production experience building large language model agents with at least one of Strands Agents, Claude Agent SDK, LangGraph, OpenAI Agents SDK, CrewAI, or a similar framework.
Understanding of agent loops, including tool calling, context management, turn limits, and streaming; experience with Model Context Protocol servers and clients and agent-to-agent communication such as A2A.
A track record of managing breaking changes in a widely used internal or open-source library, including versioning, compatibility shims, and migration tooling.
Strong distributed systems fundamentals, including timeouts, retries, idempotency, circuit breakers, backpressure, and failure propagation.
AWS experience; Amazon Bedrock and Bedrock AgentCore (Runtime, Gateway, Memory, and Identity) experience is desirable.
Clear technical writing skills for design documents, architecture decision records, and migration guides.

Responsibilities

Own the SDK as a product, including its public API, semantic versioning, deprecation policy, migration guides, and release hygiene such as reproducible builds, bounded dependencies, and publishing from the main branch only.
Design and evolve adapter and host contracts so agents behave consistently across frameworks (Strands, Claude Agent SDK, and LangGraph) and deployment targets (AgentCore Runtime, AgentCore Harness, and ECS Fargate).
Lead multi-agent orchestration patterns, including supervisor/worker and planner/executor/verifier designs, declared-peer delegation, A2A protocol support, and deliberate termination of agent loops.
Build runtime safety into the SDK, including call-chain and hop limits, session cycle budgets, timeouts, per-peer circuit breakers, and structured failures that can trigger alerts.
Define the extension model, including hooks, per-request settings, and escape hatches, and convert repeated escape-hatch use into supported features.
Own the parity and contract test suite that gates every SDK and template release.
Lead design reviews and root-cause analyses, turning incidents into lasting platform controls rather than one-off fixes.
Lead the team and mentor engineers.
Split large refactors into parallel tracks and deliver against fixed release dates.

Desired Qualifications

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

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 own the technical direction of the platform's agent SDK (`florence-agentic-ai`) and its framework adapters, the agent and MCP templates, and the runtime contract every agent on the platform depends on.

You decide what the SDK's public API is, how it changes without breaking dozens of teams, and how safety behaviors (loop guards, retry ownership, failure codes, delegation limits) hold the same way across Strands, Claude Agent SDK and LangGraph, over HTTP and A2A.

Responsibilities:

Own the SDK as a product: public API, semantic versioning, deprecation policy, migration guides and release hygiene (builds you can reproduce, bounded dependencies, publishing from `main` only).
Design and evolve the adapter and host contracts so that agents behave the same whatever the framework (Strands, Claude Agent SDK, LangGraph) or deployment target (AgentCore Runtime, AgentCore Harness, ECS Fargate).
Lead multi-agent orchestration patterns: supervisor/worker and planner/executor/verifier designs, declared-peer delegation, A2A protocol support, and ending agent loops by design. Build runtime safety into the SDK: call-chain and hop limits, session cycle budgets, timeouts, per-peer circuit breakers, structured failures that alerts can page on.
Define the extension model (hooks, per-request settings, escape hatches) and turn repeated escape-hatch use into supported features.
Own the parity and contract test suite that gates every SDK and template release.
Lead design reviews and RCAs. Turn incidents into lasting platform controls, not one-off fixes.
Act as the leader of the teama and also mentor engineers
Split large refactors into parallel tracks and deliver against fixed release dates.

Requirements:

Advanced English proficiency (C1 or above), with autonomy to communicate directly with international stakeholders
Extensive years of professional experiecne with software engineering and leading teams
Experience building libraries, SDKs or platforms used by other engineering teams.
Expert Python (async, typing, packaging, dependency management, pytest at scale).
Hands-on production experience building LLM agents with at least one of: Strands Agents, Claude Agent SDK, LangGraph, OpenAI Agents SDK, CrewAI or similar.
You understand the agent loop: tool calling, context management, turn limits, streaming. Experience with Model Context Protocol (MCP) servers and clients, and with agent-to-agent communication (A2A or equivalent).
Track record of managing breaking changes in a widely used internal or open-source library: versioning, compatibility shims, migration tooling.
Strong distributed systems fundamentals: timeouts, retries, idempotency, circuit breakers, backpressure, failure propagation.
AWS experience, ideally Amazon Bedrock and Bedrock AgentCore (Runtime, Gateway, Memory, Identity).
Clear technical writing: design docs, ADRs, migration guides.

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.

#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.

About the Company

CI&T

AI-driven digital solutions and nearshore development

CI&T provides digital solutions to help brands transform their businesses through technology. It focuses on digital strategy and software engineering, offering services such as AI-powered solutions, customer-centric design, and nearshore software development. Products and engagements work by delivering tailored digital initiatives through long-term partnerships, project-based work, and ongoing maintenance; its MRVP approach helps navigate compliance in regulated industries while still enabling innovation. CI&T differentiates itself through a global delivery model, a focus on diversity and inclusion, and an emphasis on combining strategy, engineering, and design to drive business transformation. The company targets a wide range of clients, including regulated sectors and quick-service restaurants, and aims to help clients maximize resources, scale rapidly, and thrive in a post-digital transformation landscape.

Company size: 5,001-10,000
Company stage: IPO
Headquarters: São Paulo, Brazil
Founded: 1995

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