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Lead AI Engineer — Productivity Systems

Nubank -
Rio de Janeiro, RJ

Candidatura rápida

Detalhes da vaga

Tempo integral
Há 21 horas

Benefícios

Vale-refeição
Vale-transporte
Vale-alimentação

Qualificações

Jira
Certificação AWS
Slack
Terraform
APIs
Inteligência artificial
Python
Gestão de identificação e acessos

Descrição completa da vaga

About Nu

Nu is the leading digital bank in Latin America, serving 135 million customers across Brazil, Mexico, and Colombia. The company has been leading an industry transformation by leveraging data and proprietary technology to develop innovative products and services.

Guided by its mission to fight complexity and empower people, Nu caters to customers’ complete financial journey, promoting financial access and advancement with responsible lending and transparency. The company is powered by an efficient and scalable business model that combines low cost to serve with growing returns.

Nu’s impact has been recognized in multiple awards, including Time 100 Most Influential Companies, Fast Company’s Most Innovative Companies, and Forbes World’s Best Banks.

Visit our Institutional Page

About the Role

We are looking for an engineer who has already built with AI in production. You have shipped LLM-powered systems (agents, copilots, RAG pipelines, or AI-driven automations), you know what breaks when they meet real users, and you know how to make them reliable enough for business-critical workflows.

Your day-to-day is applied AI engineering: designing agentic workflows, integrating LLMs into internal tools and business processes, building evaluation and guardrail layers, and turning manual, high-friction workflows into AI-assisted ones that thousands of Nubankers depend on.

This is not an infrastructure role. You will not spend your days on Terraform, IAM policies, or email deliverability. Cloud fluency helps, but the core of this job is the AI layer — prompts, context, agents, evaluations, integrations — and the product judgment to know where AI genuinely helps versus where deterministic automation is the right answer.

Key Responsibilities

Applied AI & Agentic Systems

Design, build, and ship LLM-powered agents and workflows that automate complex internal processes end-to-end.
Work hands-on with frontier models and the modern AI stack: tool/function calling, structured outputs, MCP, RAG, multi-agent orchestration.
Own the full lifecycle of an AI system: from problem discovery and prototype to production hardening, monitoring, and iteration.

Evaluation & Reliability

Build evaluation harnesses, guardrails, and quality feedback loops so AI systems can be trusted in production — not just demoed.
Define what "good" looks like for non-deterministic systems and instrument it: evals, regression suites, human-in-the-loop review where it matters.

Intelligent Workflow Automation

Use orchestration platforms (e.g., n8n) and custom integrations as delivery vehicles for AI-in-the-loop automation across business units.
Integrate enterprise platforms (Slack, Google Workspace, Jira, internal APIs) into coherent, AI-assisted workflows.

AI Adoption & Governance

Drive the technical strategy for AI adoption within engineering and business workflows.
Develop governance frameworks that make AI coding assistants and agents safe, compliant, and effective — balancing developer freedom with security and operational risk.

Multiplier Work

Create Golden Paths, reference implementations, and documentation that let other teams build AI workflows safely on their own.
For Lead/IC6: act as the technical reference for applied AI in the domain, influence architecture beyond the immediate team, mentor senior engineers, and partner with ITSec and Privacy to align AI solutions with company policy.
For Senior/IC5: execute complex AI projects with high autonomy, identify workflow bottlenecks worth automating, and mentor mid-level engineers.

What are we looking for?

Must Have — Demonstrated Applied AI Experience

Shipped LLM systems in production: at least one real system with an LLM at its core — an agent, copilot, RAG application, or AI-driven automation — used by real users, not a proof of concept.
Hands-on AI engineering: practical fluency with prompt and context engineering, tool/function calling, structured outputs, and agent frameworks or orchestration patterns.
Evaluation mindset: experience measuring and improving AI output quality — evals, test sets, feedback loops — and an honest understanding of failure modes (hallucination, drift, prompt injection).
Solid software engineering foundation: proficiency in Python, TypeScript, or Clojure; strong API and integration skills; the discipline to ship maintainable systems, not notebooks.
AI product sense: the judgment to identify which problems deserve an LLM, which need deterministic automation, and which should not be automated at all.

Nice to Have

Experience with workflow automation platforms (n8n, Zapier, or custom orchestration engines).
Exposure to cloud services (AWS) and infrastructure-as-code.
Familiarity with AI developer tooling (Claude Code, Cursor, Copilot) and AI governance practices.

Behavioral & Strategic Skills

Builder bias: you prototype fast, validate with real users, and harden what works.
Governance-aware: you understand that "efficiency" must be balanced with "security," and you can design AI systems that are safe by default without destroying velocity.
Multiplier: you enjoy documenting your work, creating Golden Paths, and teaching others how to use what you build.
Comfortable with ambiguity: AI capabilities shift monthly; you treat that as an opportunity to re-solve problems better, not as churn.

Our Benefits

Chance of earning equity at Nubank
Food/ Meal Card (Vale-Refeição and/or Vale Alimentação)
Public Transportation Commuting Benefit (Vale-Transporte)
NuCare – Psychological, Financial and Legal Assistance Program
Life Insurance
Medical Plan
Dental Plan
NuLanguage – Language Course Program
Nucleo - Our learning platform of courses
Extended Parental Leave
Daycare Allowance
Parental Consultancy
Work-from-home Allowance
Gym Partnerships
30 days of paid vacation
Relocation Assistance Package, if applicable

Work Model for this Role

Our hybrid work model brings us to the office at least twice a week, on strategic days designed to maximize team connection and collaboration. For more details, visit https://building.nubank.com/nu-hybrid-work-model/

Our recruitment process may involve the use of artificial intelligence–enabled tools, such as automated interview transcription and analysis, to support the evaluation process. Artificial intelligence is not used to make final hiring decisions; all decisions are made by human reviewers.

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About Nu

About the Role

Key Responsibilities

What are we looking for?

Our Benefits

Work Model for this Role

Our hybrid work model brings us to the office at least twice a week, on strategic days designed to maximize team connection and collaboration. For more details, visit https://building.nubank.com/nu-hybrid-work-model/

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About Nu

About the Role

Key Responsibilities

What are we looking for?

Our Benefits

Work Model for this Role Our hybrid work model brings us to the office at least twice a week, on strategic days designed to maximize team connection and collaboration. For more details, visit https://building.nubank.com/nu-hybrid-work-model/

Work Model for this Role

Our hybrid work model brings us to the office at least twice a week, on strategic days designed to maximize team connection and collaboration. For more details, visit https://building.nubank.com/nu-hybrid-work-model/