Hi, I’m Ioannis Mesionis, a Senior AI/ML Data Scientist at King with ~6 years of experience delivering innovative data science solutions across various industries.

What I Do

  • 🤖 Machine Learning & AI: Developing and deploying ML models for production environments
  • 📊 Data Science: Extracting insights from complex datasets to drive business decisions
  • 🎯 Recommender Systems: Building collaborative filtering and personalization engines
  • 📈 Predictive Modeling: Creating models for customer behavior and business optimization
  • 🎮 Gaming Analytics: Leveraging data to enhance player experiences and engagement

Background

I hold a Mathematics degree from the University of Ioannina (2010-2015), where I graduated among the top 7.3% of my department. Currently, I’m expanding my business acumen through a Quantic Executive MBA program (2025-2026).

Technical Skills

  • Languages: Python, R, SQL
  • ML/AI: Scikit-learn, TensorFlow, PyTorch, MLflow
  • Analytics: Collaborative Filtering, Customer Segmentation, A/B Testing
  • Visualization: D3.js, Tableau, matplotlib, seaborn
  • Cloud: AWS, GCP, Azure

Certifications

  • Mastering D3 (Udemy)
  • The Complete SQL Bootcamp (Udemy)
  • Exploratory Data Analysis (Coursera)
  • R Programming (Coursera)

Beyond Work

When I’m not diving deep into data, you can find me:

  • 🏋️ CrossFit: Competing and staying fit (multiple competition wins)
  • 🎤 Speaking: Industry presentations at BrainStation, Rework AI, and AI Summit
  • 🌍 Languages: Native Greek, Professional English, Elementary Spanish
  • 🎖️ Military: Former military police sergeant with first-place finish in 8000-meter competition

Let’s Connect

I’m passionate about sharing knowledge and connecting with fellow data enthusiasts. Whether you’re interested in collaborative filtering, expected value frameworks, or the latest in ML ops, I’d love to hear from you!

📧 Feel free to reach out via LinkedIn or explore my projects here on this blog.