About Me

I'm Lionel, half French, half German, fully into data. I help companies make sense of what they already have and build the infrastructure for what they don't yet.

I work as a freelance consultant, mostly with small and mid-sized companies. Sometimes that means building a data setup from scratch, sometimes it means joining an existing team to push a specific project forward. Both work for me.

Lately I've been doing more AI work, integrating LLMs into products and workflows, and building web apps on the side. I like building things end to end.

What I work on

Data architecture and analytics engineering: warehouses, data models, ELT pipelines
Business intelligence: dashboards, reporting, self-service setups
Advanced analytics: marketing attribution, pricing analytics, causal inference
AI integration: LLMs in products and internal workflows
Tracking and web analytics: GA4 setups, event tracking, privacy-first analytics
Web and app development: internal tools, prototypes, products
Data strategy and leadership: team building, stakeholder management, analytics roadmaps

Tools & Technologies

Languages: SQL, Python, TypeScript, HTML/CSS

Cloud & Infrastructure: GCP, AWS, BigQuery, Snowflake, Microsoft Fabric

Data & Analytics: dbt, dataform, Airbyte, Fivetran

BI & Visualization: Metabase, Looker Studio, Power BI, GA4

Web: Next.js, React, Vercel

AI: Claude, OpenAI, LLM integration

Background

Before becoming a freelancer, I was Head of Data and Analytics at mymuesli, where I built and led the data team. Before that I worked as a data scientist and analytics engineer at a few companies in Berlin.

B.Sc. in Mathematics, TU Berlin. Trained airline pilot (Lufthansa Flight Training). Outside of work: padel, guitar, backpacking, and wasting time on vibe-coding this website.

Let's connect