Tristan Achache

Tristan Achache is a Data Analyst at Hymaïa. With five years of experience, he specializes in exploring, cleaning and transforming data, building activity reporting, and ensuring KPI reliability, with strong command of SQL, BigQuery, Python, Tableau, Airflow and Dataform.

Before joining Hymaïa, Tristan spent five years at Cityscoot, the Paris-based free-floating electric scooter service. Starting as a production engineer, he then joined the Data team, where he ran ad hoc analyses (battery behavior, user segmentation, geospatial analysis), built operational and business KPI reporting, studied cohorts and churn causes, and created interactive dashboards for the marketing, product and field teams. He also contributed to data modeling in a data mesh and to data migration projects.

A graduate of EPF École d'Ingénieurs (Engineering & Management track), Tristan began his career at Thales in Singapore. He enjoys turning business needs into actionable metrics and clear visualizations.