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Jaime – LLM, RAG, Python, experts in Lemon.io

Jaime

From Spain (UTC+2)flag

AI Engineer|Middle-to-senior
Machine Learning Engineer|Middle-to-senior
AI Agent Architect|Senior
MLOps Engineer|Middle-to-senior

Jaime – LLM, RAG, Python

Jaime is a Senior AI Agent Architect with strong expertise in Python, LLM-based systems, multi-agent orchestration, and cloud-native architectures. He has designed and delivered production AI solutions, including a 25-agent Text-to-SQL system and custom RAG pipelines for code analysis. Through his startup experience, Jaime has taken full ownership of AI initiatives, from architecture and technical direction to hands-on implementation. He combines strong engineering skills with clear communication, practical decision-making, and experience operating independently in fast-paced, ambiguous environments.

3 years of commercial experience in
AI
Main technologies
LLM
3 years
RAG
3 years
Python
4 years
AWS
1 year
FastAPI
2 years
Multi-agent systems architecture
3 years
AI agent orchestration
3 years
MLOps
1 year
AI telemetry
1 year
Additional skills
LangChain
OpenAI
Qdrant
LangGraph
Direct hire
Possible
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Experience Highlights

Senior AI Engineer
Jul 2025 - Ongoing11 months
Project Overview

An AI-powered Text-to-SQL engine that combines ad performance data and video creative insights to generate actionable recommendations and explain the reasoning behind them.

Responsibilities:
  • Coordinated a production multi-agent AI system that translated natural language into SQL over advertising data warehouses;
  • Implemented a semantic layer consistency engine that detected and resolved duplicate or conflicting schema definitions produced by LLM agents;
  • Built a SQL validation pipeline that executed queries against the live warehouse, used an LLM judge to verify results against user intent, applied business-logic rules, and transformed data for charts;
  • Implemented a chart generation pipeline using LLMs to display data;
  • Designed configurable failure handling across the full query pipeline with per-step retry or partial-result policies;
  • Architected a serverless LLM system on AWS Lambda to expose individual agents and support asynchronous processes;
  • Built an Actions Agent that evaluated ad entity signals and generated structured campaign recommendations, action parameters, rationales, impact estimates, and execution plans with self-correcting validation loops.
Project Tech stack:
LLM
AWS
AWS Lambda
SQL
Senior AI Engineer
Mar 2025 - Jul 20254 months
Project Overview

A platform for creating, owning, and interacting with autonomous 3D AI agents that operate across games, virtual worlds, and other digital experiences.

Responsibilities:
  • Built a Redis-backed internal memory system persisting tool calls, results, and arguments across workflow executions;
  • Engineered stateful dynamic agentic flows with global request state, enabling LLMs to adapt tool usage without predefined paths;
  • Improved initial streamed message latency from 5s to 2s via background task orchestration for parallel workflow.
Project Tech stack:
Python
Docker
AWS
Redis
AWS Lambda
PostgreSQL
RAG
Middle AI Engineer
Jan 2023 - Mar 20252 years 1 month
Project Overview

A custom RAG-based solution designed to process insurance policy data across multiple countries and provide accurate answers to complex domain-specific queries.

Responsibilities:
  • Designed and implemented a GraphRAG pipeline from scratch;
  • Developed graph creation features, including entity extraction, relationship mapping, and chunk relationships;
  • Built graph querying capabilities with entity-relationship similarity search and keyword-based retrieval;
  • Implemented routing workflows using chain-of-thought reasoning for accurate response generation;
  • Improved accuracy from 60% to 92–95% across multiple PDFs, enabling production deployment as an agent-assist solution;
  • Leveraged PostgreSQL for similarity search, Python for implementation, NetworkX for graph logic, and FastAPI for backend development;
  • Deployed the solution in a cloud environment using Web Apps, Cosmos DB, and Azure DevOps CI/CD pipelines;
  • Migrated the solution to Azure, including graph creation, document extraction, prompt management, secret storage, and graph querying;
  • Used Azure Document Intelligence to extract text from tables;
  • Used Cosmos DB for prompt management and KeyVault for secret storage;
  • Enabled Azure AI Search for graph creation, graph querying with NetworkX, and similarity search for relevant document extraction;
  • Collaborated in an Agile SCRUM environment to ensure iterative and high-quality delivery.
Project Tech stack:
RAG
PostgreSQL
Python
FastAPI
Microsoft Azure
Azure DevOps
CI
CD
Owner and Creator
May 2024 - May 2024
Project Overview

An Agentic RAG solution for Python repositories that enhances code understanding and query answering through structure-aware retrieval and contextual analysis.

Responsibilities:
  • Optimized chunking strategies for Python repositories by leveraging the language structure and schema;
  • Defined function definitions as nodes and class definitions as parent nodes with methods as child nodes;
  • Created additional relationships between chunks based on programming-language syntax and code references;
  • Provided a richer context to the LLM model for answering code-related queries.
Project Tech stack:
PostgreSQL
Bash
Python
Docker
RAG
LLM
Owener and Creator
Dec 2023 - Dec 2023
Project Overview

A Python library for structure-aware code chunking that leverages language syntax to optimize chunk sizes and preserve relationships between code elements.

Responsibilities:
  • Built a Python library to create dynamic chunk sizes that kept complete functions, methods, classes, and code blocks together;
  • Implemented chunk relationships beyond parent-child and previous-next.
Project Tech stack:
Python

Education

2022
Physics
Grado
2025
AWS Solutions Architect Asssociate
878 / 1000

Languages

Spanish
Advanced
English
Advanced

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