I am

Jonas

A contemporary data generalist, inspired by the creative challenge.

Jonas Haahr

About

I like turning messy data into something a business can actually act on. What started as a way to explore that outside the classroom has grown into a collection of projects spanning data engineering, BI, analytics, and a bit of AI.

Back in April 2024, during our studies, a friend and I started Nordic Raven Solutions, a small side practice we use to take on real data work and keep learning. Collaborations so far include Paper Check and my University Dormitory (yes, really).

Since then I have graduated with my MSc in Business Intelligence from Aarhus University (Nov. 2025), and kept building this portfolio to show what I can do with those skills beyond coursework.

MSc
Business Intelligence, Aarhus University
Data Eng · BI · Analytics
Where I work, with AI in the mix
DA · EN · DE
Danish · English · German

What I love doing

Data Engineering / BI

Technologies: SQL, PostgreSQL, ETL/ELT, Azure, Microsoft Fabric, Power BI, Apache Superset, Arelle (XBRL)

What It Means: My home base: getting data modeled, cleaned, and trustworthy, then into dashboards people actually use to make decisions.

Analytics & Modeling

Technologies: Python, scikit-learn, XGBoost, LightGBM, Classification/Regression, Forecasting

What It Means: Comfortable pairing domain knowledge with practical models to answer real business questions, not modeling for its own sake.

Generative AI / LLMs

Technologies: LangChain, RAG, ReACT, OpenAI, Gemini, Transformers, NLP

What It Means: Build LLM/RAG and agentic tools where they add value. I've used them in real projects and at work, as one tool among many.

Tooling & Deployment

Technologies: Docker, Git, FastAPI, Streamlit, Next.js, GCP, Railway

What It Means: Can take a project from notebook to something deployed and usable: the glue that turns analysis into a working tool.

My Latest Projects

Turn raw SEC filings into analysis and forecasts
Live Demo

Turn raw SEC filings into analysis and forecasts

Every number traces to its source filing, with automated forecasts near analyst-level accuracy

Instant data lookup for any Danish address
Live Demo

Instant data lookup for any Danish address

Combines 5 government and public sources in seconds, including 2 undocumented APIs I reverse-engineered

BI dashboard benchmarking Novo Nordisk vs its peers
Portfolio Showcase

BI dashboard benchmarking Novo Nordisk vs its peers

Five years of financial fundamentals, innovation returns, and market position in one view

Automated home price prediction and valuation for Aarhus
Portfolio Showcase

Automated home price prediction and valuation for Aarhus

More accurate than every version of the government's own valuation model as of 2026.

Day-ahead power price forecasting and backtesting
Research Project

Day-ahead power price forecasting and backtesting

A forecast accurate enough to build a trading edge that held up on a blind holdout

Kaggle ML house price prediction
Kaggle Competition

Kaggle ML house price prediction

Global top 8.1% of 5,887 competitors

End-to-end job-search automation
Open Source

End-to-end job-search automation

One system that scans, applies, preps for interviews, and identifies upskilling focus areas

Automated research and news curation
Case Study

Automated research and news curation

A multi-agent pipeline that finds, dedupes, and quality-scores 150 AI research and news articles down to the 6 best each run, for under $0.50

In-browser AI tutor for Python and SQL
Live Demo

In-browser AI tutor for Python and SQL

Runs your code and gives real-time AI feedback

RAG system for searching through lecture notes
Live Demo

RAG system for searching through lecture notes

Ask a question in natural language, get an answer pulled straight from thousands of pages of my university course material

Get in Touch

Interested in working together? Let's talk :)

Contact Information

Feel free to reach out about roles, project collaborations, or just to talk data, BI, and analytics.