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Javier – Python, LLM, LangChain, experts in Lemon.io

Javier

From Spain (UTC+2)flag

AI Engineer|Senior

Javier – Python, LLM, LangChain

Javier is a Senior AI Engineer with strong hands-on expertise in LLM application design, RAG systems, and agentic orchestration using Python, LangChain, and AWS. He has led the development of applied AI solutions for regulated domains, including pharma and legal, focusing on retrieval pipelines, prompt engineering, and system evaluation. Screenings confirm clear technical communication, stakeholder collaboration, and ownership of complex AI projects. His backend skills are solid but less advanced than his AI engineering strengths.

5 years of commercial experience in
AI
Business intelligence
Cloud computing
Healthcare
Legal tech
Machine learning
Pharmaceutics
Travel
NLP software
Main technologies
Python
7 years
LLM
3.5 years
LangChain
3 years
AI
6 years
AWS
3 years
Additional skills
AI agent development
OpenAI
RAG
Claude LLM
Machine learning
AI chatbot development
LangGraph
NLP
Docker
Vector Databases
GCP
SQL
Direct hire
Possible
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Experience Highlights

AI Engineer
Feb 2025 - Ongoing1 year 1 month
Project Overview

It is a domain-tuned GenAI solution for pharma research and review-heavy workflows. The product helped internal expert teams retrieve, extract, and process knowledge from domain documentation faster and more consistently, reducing manual review effort and improving research operations.

Responsibilities:
  • Designed and delivered retrieval and generation workflows for domain-specific knowledge tasks;
  • Improved extraction accuracy and reliability through embedding optimization and context-aware retrieval;
  • Built agentic extraction workflows with tool orchestration for multi-step processes;
  • Collaborated with stakeholders to turn high-friction manual workflows into production-oriented AI features.
Project Tech stack:
Python
LLM
RAG
LangChain
LangGraph
Docker
NLP
AWS
Machine learning
AI
Data Scientist & AI Engineer
Mar 2023 - Feb 20251 year 11 months
Project Overview

It is a LLM-based systems for healthcare and legal use cases, focused on knowledge retrieval, compliance-oriented workflows, and multi-step execution.

Responsibilities:
  • Built RAG-based systems with memory to improve retrieval quality and iterative task execution;
  • Developed compliance-checking workflows using embeddings and domain-aware retrieval patterns;
  • Designed agentic flows for multi-step reasoning and task orchestration;
  • Contributed to evaluation thinking across retrieval quality and answer quality, rather than treating them as the same problem.
Project Tech stack:
Python
LLM
RAG
NLP
LangChain
LangGraph
Vector Databases
AI
AWS
GCP
AI Engineer & Data Scientist
Jul 2022 - Mar 20238 months
Project Overview

It is an OCR-based document processing solution to extract and structure information from freelancers invoices more reliably. The project also included cloud-based analytics workflows that improved reporting and data-driven decision-making for stakeholders.

Responsibilities:
  • Developed an OCR system that improved data extraction accuracy from 40% to 84%;
  • Built ML-based document processing pipelines integrated with cloud analytics workflows;
  • Improved data reliability by transforming unstructured inputs into structured outputs for reporting and stakeholder use.
Project Tech stack:
Python
Machine learning
GCP
AI
NLP
ML&AI Engineer
Apr 2021 - Jul 20213 months
Project Overview

An NLP solution designed to analyze large volumes of customer feedback by identifying recurring topics and sentiment patterns across reviews using clustering methods. The system transforms unstructured customer comments into structured, actionable insights to support decision-making around customer experience and business priorities.

Responsibilities:
  • Вeveloped Python-based NLP workflows to process and analyze customer review data;
  • Created topic clustering logic to identify recurring themes in large sets of feedback encoding text via techniques such as TF-IDF;
  • Implemented sentiment analysis to detect positive and negative customer patterns using open-source models;
  • Helped convert unstructured text into business-facing insights for decision-making and customer experience analysis.
Project Tech stack:
Python
Machine learning
NLP
Data analysis

Education

2023
Artificial Intelligence
Master’s Degree
2022
Computer Science – Computation and Intelligent Systems
Bachelor’s Degree / International Degree

Languages

Catalan
Advanced
Spanish
Advanced
English
Advanced

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