Ioannis Mesionis is an accomplished data scientist and trusted leader in easyJet’s Data Science and Analytics team. Since joining easyJet in 2019, he has risen to the role of Lead Data Scientist and leads the airline’s MLOps efforts, supporting easyJet’s ambition of becoming the world’s leading data-driven airline.

In his current position, Ioannis works cross-functionally with Digital, Customer, and Marketing to produce robust data products and solve business problems. He has designed a practical data product operating model that includes a single front door for intake, a Definition of Done template with KPIs and fail-fast checks, and inception processes covering exploratory data analysis and GDPR feasibility.

His technical focus covers the full machine learning lifecycle: R&D sprints, pilot and A/B testing against baseline KPIs, production rollouts, and model monitoring with tools such as MLflow, Prefect, Airflow, and Evidently for drift detection. Through this work, Ioannis helps operationalize, scale, and govern AI solutions enterprise-wide.