We are looking for a Lead Backend Developer with Python and AI expertise to drive the design and delivery of robust AI-powered API services and agentic workflows, while providing technical leadership across the team.

This role focuses on language model interaction with internal systems, vector databases, and external tools via orchestration frameworks, treating LLMs as components in a secure, scalable distributed system. You will define technical direction, own API contracts and service reliability end-to-end, ensure AI edge cases fail gracefully, and integrate LLMs using rigorous systems engineering with built-in evaluation, observability, fallback handling, and cost awareness. As a lead, you will also mentor engineers, shape architecture across pods, and champion engineering excellence.

Responsibilities

Lead the design and implementation of backend API services and LLM orchestration layers
Define and evolve reliable, reusable orchestration frameworks and logic for downstream developer consumption
Architect and oversee complex RAG pipelines, including document ingestion, chunking,



embedding, and retrieval optimization
Drive the development and integration of agent tools using LangChain, LangGraph, and potentially MCP (Model Context Protocol)
Set the standard for integrating LLMs with rigorous systems engineering, embedding evaluation, observability, fallback handling, and cost awareness
Establish and enforce practices for security, privacy, enterprise-grade observability, and test coverage across all backend workflows
Own API contracts and service reliability end-to-end, ensuring AI edge cases fail gracefully
Lead architecture decisions and define engineering standards within and across pods
Mentor and coach backend engineers, conduct code reviews, and foster a culture of technical excellence
Collaborate closely with frontend engineers, data engineers, infrastructure teams, product managers, and stakeholders to align technical strategy with business goals

Requi

📌 Lead Backend Developer (Argentina)
🏢 EPAM Systems
📍 Argentina