I built and deployed Markous.ai, an equity-analytics platform for Athens Exchange and US equities, with LLM-assisted analysis and more than 600 automated tests. Its portfolio engine includes constrained Markowitz optimization, risk parity, and Monte Carlo simulation, evaluated with expanding-window walk-forward validation.
In my Football Analytics Portfolio, I built a modular Python package for market-value forecasting, FIFA-rating reconstruction, and player profiling. Chronological validation and training-only scaling helped cut 2024 market-value forecasting MAE by 35.6% against a persistence baseline.
I also built a tested credit-card fraud detection pipeline that caught 57 of 74 held-out frauds with 100 alerts. It compared six classifiers against a no-skill baseline using consecutive out-of-time periods.
At Eurobank Equities, I provide front-line support to clients using a live trading platform, troubleshoot issues in real time, and explain them to clients and internal teams. I document recurring incidents and escalate feedback to improve platform reliability and usability.
