Lead AI Engineer — Productivity Systems

Stack

Responsibilities

• ▹Design, build, and ship LLM-powered agents and workflows that automate complex internal processes end-to-end
• ▹Work hands-on with 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 and monitoring
• ▹Build evaluation harnesses, guardrails, and quality feedback loops so AI systems can be trusted in production
• ▹Use orchestration platforms (e.g., n8n) and custom integrations to deliver AI-in-the-loop automation across business units
• ▹At Lead level: act as the technical reference for applied AI, influence architecture, mentor senior engineers, and partner with ITSec and Privacy

Requirements

• ▹Shipped at least one production LLM system (agent, copilot, RAG application, or AI-driven automation) used by real users
• ▹Hands-on AI engineering: prompt and context engineering, tool/function calling, structured outputs, agent frameworks
• ▹Evaluation mindset: experience measuring and improving AI output quality and understanding failure modes (hallucination, drift, prompt injection)
• ▹Solid software engineering foundation: Python, TypeScript, or Clojure, strong API/integration skills, maintainable systems
• ▹AI product sense: judgment on which problems deserve an LLM versus deterministic automation, or no automation 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

Soft skills

What we offer

• ▹Opportunity of earning equity
• ▹Medical, dental, and vision insurance
• ▹Life insurance and AD&D
• ▹Extended maternity and paternity leave
• ▹Nucleo, NuLanguage, NuCare internal programs
• ▹401K plan, HSA/FSA, work-from-home allowance, relocation assistance if applicable

About the company

Nu (Nubank) is Latin America's leading digital bank, serving more than 135 million customers across Brazil, Mexico, and Colombia. Listed on the NYSE (NU), the company combines proprietary technology and data intelligence to redefine financial services.