AI Engineer / Senior AI Engineer - Agentic Systems & LLM Integration in Santiago, Chile

Role: AI Engineer / Senior AI Engineer (Agentic Systems & LLM Integration) Location: Santiago, Chile Employment Type: Full Time (Hybrid) Role Summary KR Elixir Inc. is seeking an experienced AI Engineer to design, build, and operate production-grade agentic AI systems and large language model (LLM) integrations. This role is responsible for the technical implementation of multi-agent architectures, retrieval-augmented generation (RAG) pipelines, tool and function calling, evaluation frameworks, and session/state management to ensure LLM-based applications perform reliably and safely in customer environments. Key Responsibilities Design and implement multi-agent architectures and runtime components that persist conversation/session state, including checkpointers and persistence layers. Build and operate RAG pipelines, incorporating vector search, reranking (e.g., cross-encoder), and context hygiene techniques to minimize hallucinations. Implement function and tool-calling integrations such as API/function binding, JSON schema outputs, and runtimes that execute and feed results back to LLMs. Create evaluation and testing frameworks, including LLM-as-a-Judge workflows, golden datasets, and rubrics for automated grading of model outputs. Develop conversation history and context window strategies to ensure multi-turn references resolve correctly. Collaborate with engineering and infrastructure teams to integrate LLMs, vector databases, Postgres databases, and monitoring/telemetry systems for production resilience. Produce clear technical designs, runbooks, and unit/integration tests for agent components to enable reproducible failures and component-level observability. Work closely with product, data science, and QA teams on deployment, A/B testing, and performance tuning. Required Skills & Experience Proven experience building production LLM/agent applications or RAG systems. Hands-on expertise with agent frameworks and persistence concepts.