My interest in data science and economics began in high school with a deep affinity for numbers, analytical methods, and economic theory. This led me to the Barcelona School of Economics, where I completed two Master's degrees: one in Economics of Energy, Sustainability and Climate Change, and a second in Data Science for Decision Making — where I explored machine learning, deep learning, NLP, and their applications in finance.
Beyond academia, I have gained substantial professional experience across leading institutions. At the European Central Bank, I developed a full-stack web application for supervisory metadata, built automated validation pipelines for Pillar 3 compliance, and prototyped a Python AI inbox agent using a RAG pipeline. At the International Energy Agency, I migrated investment calculation models to Python, co-authored a section of the IEA's published report on electricity in the Middle East and North Africa, and built a web scraping tool for large-scale data collection. At Deloitte, I created Tableau dashboards and Python/SQL workflows for M&A due diligence analytics.
From validating Pillar 3 bank disclosures at the ECB to spatial econometrics and event studies, I analyze structured and unstructured data to extract actionable insights. I enjoy building visual representations that surface unexpected findings.
I build end-to-end data solutions: full-stack web applications, Python automation pipelines, AI agents with RAG, and ML models. My stack spans Python, SQL, R, and web technologies, deployed across financial, energy, and supervisory domains.
I co-authored a section of the IEA's published report on electricity in MENA, and regularly present complex findings to technical and non-technical audiences alike. Fluent in French, English, and German, I work effectively across international and multilingual teams.
You can contact me through my email: mathieu.breier@bse.eu
You can download my CV here
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Github: https://github.com/mtbrr26
LinkedIn: https://www.linkedin.com/in/mathieu-breier/
© Mathieu Breier