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Achievement: Pull Sharkx3Achievement: YOLO

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datafromlopes/README.md

Hi, I'm Diego Lopes 🤘🏻

Lead Data Engineer · Data & AI Architecture · MSc Researcher @ IME-USP · Text-to-SQL

I build large-scale data platforms and production AI systems, and I research natural language interfaces for databases.

At work I own the data and AI architecture of a global e-commerce (LATAM and Europe): event-driven ingestion on GCP, a medallion lakehouse on BigQuery, and a WhatsApp customer service agent built with LangGraph on Vertex AI, with RAG, MCP tool calling and evaluation pipelines. Before that I spent 7 years on distributed data systems, including a 12-node, 3-AZ Cassandra cluster handling 1.46B+ writes a day at 13µs P50 latency and 99.99% availability.

At USP my research sits between NLP and databases: how to fine-tune compact LLMs to translate Portuguese questions into executable geospatial SQL.

Website LinkedIn ORCID Hugging Face

Research

AtlasSQL-BR: A Brazilian Portuguese Geospatial Text-to-SQL Dataset with Spatial Hierarchies Diego O. Lopes, Kelly R. Braghetto. Proceedings of the 41st Brazilian Symposium on Databases (SBBD 2026), pp. 85-98. Paper · Code · Dataset

MSc in Computer Science, IME-USP (dissertation submitted, defense in October 2026), advised by Prof. Kelly R. Braghetto.

Interests

  • Natural language interfaces for databases and semantic parsing
  • LLM fine-tuning for specialized domains (PEFT: LoRA, IA³)
  • Execution-based evaluation of generated SQL
  • Portuguese and other low-resource settings in Text-to-SQL

Featured projects

Project What it is
atlas-sql-br Geospatial Text-to-SQL dataset in Portuguese, fine-tuning pipeline and execution-based evaluation framework (PostGIS, sqlglot, MLflow)
matrix_multiply_optimizer Matrix multiplication in C, from naive loop to cache-blocked and vectorized, profiled with gprof and perf. 99.3% less execution time than baseline

Stack

Languages Python · SQL · C Distributed data Apache Cassandra · Kafka · Apache Iceberg · Trino · Spark · Flink Cloud and platform GCP (BigQuery, Pub/Sub, Cloud Run, Vertex AI, Dataform) · AWS (S3, EC2, Glue) · Airflow · dbt AI engineering LangGraph · Vertex AI Agent Engine · RAG · MCP · PyTorch · Hugging Face Transformers · PEFT Databases PostgreSQL/PostGIS · Cassandra · MongoDB

Open to collaborating on

  • Text-to-SQL and natural language interfaces for relational and geospatial databases
  • LLM evaluation for specialized or low-resource domains
  • NLP datasets and benchmarks in Portuguese
  • Large-scale data platform architecture

Contact

📫 diego.lopes@datafromlopes.com · datafromlopes.com

⚡ Private pilot, aviation and aircraft systems enthusiast ✈️

Pinned Loading

  1. atlas-sql-br atlas-sql-br Public

    AtlasSQL-BR: A Brazilian Portuguese Geospatial Text-to-SQL Dataset with Spatial Hierarchies

    Python 1

  2. matrix_multiply_optimizer matrix_multiply_optimizer Public

    This repository provides optimized implementations of matrix multiplication algorithms in C. It explores techniques like blocking, vectorization, and loop reordering to maximize performance.

    C 1