Software, data and AI for real problems.

I'm Ian Vaz Araujo, a developer and data professional. My focus is turning manual processes and scattered information into useful tools, clear analysis and practical AI applications. I currently work at Turim MFO.

Here I share projects and technical decisions across software, data and AI, alongside writing on finance and technology.

Software, data and applications

Selected projects

• From open data to healthcare indicators

  A Databricks, Spark and AWS pipeline that organizes ANS public data and supports analysis in Metabase.

  Python · Spark · AWS · SQL

  Full study in Portuguese

• Language models for financial text

  Adapting BERT models for sentiment analysis in asset manager letters, with documented methodology and evaluation.

  Python · NLP · Transformers · PEFT

  Full study in Portuguese

• Machine learning for fraud detection

  A public-data study of transaction classification and the trade-off between detecting fraud and raising false alarms.

  Python · Machine Learning · Model evaluation

  Full study in Portuguese

Experience

• Challenges in Building Robust Classifiers on Imbalanced DatasetsNov 2024
• Ibovespa or IPCA+6.5%: Which Is the Better Investment?Oct 2024

Contact

Have a process that could work better, a data question or an application idea? Share the context on LinkedIn. I enjoy exchanging ideas about software, data and AI challenges.