Stefanos Mandalas

Lead and mentor the team to consistently deliver 2-month PIs 2 weeks early by optimizing the design process and identifying critical, orthogonal features. This has reduced refactor-related Jira tickets by 90%, lowered code duplication to 3%, and minimized QA-reported bugs to fewer than 10 per PI.

Design, develop, and manage a large-scale low-code platform for data analytics, supporting 30+ task types (e.g., connectors, SQL, ML) and 10+ data visualizations. Built with hexagonal architecture, it integrates Airflow, MLflow, Spark/Hadoop, Trino, and Kafka, spanning 20+ repositories and 30+ pods on a Helm-managed Kubernetes cluster using a GitOps approach.

Integrated 14 legacy systems into a unified data pipeline using Apache Kafka and Camel on Spring Boot, resulting in a tenfold increase in data synchronization speed. Led a team of 3 in developing an event notification system web app, which successfully processed over 50,000 events daily. Provided support to 27 applications, ensuring 100% uptime through blue-green deployment on Azure. Managed databases, ETL pipelines, and orchestration clusters for ESMA during a 1-month on-site mission in Paris, ensuring continuous operations while the security team executed recovery actions.