Open to opportunities

Yago Lopes

@yagolopes

Message

AI developer building Python backends and LLM-powered applications.

Brazil

Message

What I'm looking for

I’m looking to build reliable LLM integrations and Python backends—shipping scalable APIs, data pipelines, and agent workflows using modern tooling, with room to grow full-stack delivery and production impact.

I’m an AI Developer with 4+ years building Python backends, REST APIs, and LLM-powered applications. I focus on production workflows—integrating OpenAI and Claude APIs to automate analysis and improve reliability.

Most recently, as an LLM Agentic Trainer at Turing, I evaluate and fine-tune LLM agents (including Google Gemini), identify systematic errors, and strengthen output reliability. I also automate 60% of data validation workflows by building Python scripts to parse, clean, and transform large-scale JSON and SQL datasets, while optimizing PostgreSQL queries and analytics validation pipelines to reduce processing time by 30%.

Earlier, as a freelance Python developer (2021–2025), I integrated OpenAI and Claude APIs into automation workflows, reducing manual analysis time by 50% and increasing productivity. I built backend applications and internal tools with FastAPI/Django and PostgreSQL, designed pipelines for millions of financial data points (cutting manual collection by 70%), and developed validated backtesting systems that improved predictive performance and decision accuracy by 20%.

Experience

Work history, roles, and key accomplishments

Current

LLM Agentic Trainer

Current

Turing

Oct 2025 - Present (8 months)

Evaluated and fine-tuned LLM agents (Google Gemini), identifying systematic errors to improve output reliability and agent workflow performance. Built Python-based data validation automation that reduced processing time by 30% and automated 60% of validation workflows by parsing, cleaning, and transforming large-scale JSON/SQL datasets.

LLM Fine tuning Prompt Engineering AI Agent Workflows Python Data Parsing Data Cleaning JSON SQL PostgreSQL Query Optimization

Freelance Python Developer

Self Employed

Jan 2021 - Jan 2025 (4 years)

Integrated OpenAI and Claude APIs into automation workflows, reducing manual analysis time by 50% and increasing productivity. Built FastAPI/Django + PostgreSQL backend tools and scalable data pipelines processing millions of financial data points, reducing manual collection effort by 70%, and improved backtesting predictive performance by 20%.

Python fastAPI Django PostgreSQL OpenAI API Claude REST API Development Data Pipelines Data Validation

Data Analyst

Suno Research

Jan 2020 - Jan 2021 (1 year)

Analyzed large-scale financial datasets from B3-listed companies using Python and SQL, generating insights for 50K+ paying subscribers. Built automated data pipelines and interactive dashboards to track KPIs and support data-driven business decisions.