Profile
He Doesn't Just Engineer Data.
He Engineers Careers.
There's a moment in most engineers' careers when the craft stops being enough. The pipelines hum, the dashboards load, the Slack messages say "looks good" - and somewhere behind all of it, an actual human being wonders: is this all there is? Mehdi Ouazza had that moment. His answer was to write about it, talk about it, teach it, film it, and build a community around it. He did not pivot away from engineering. He made engineering the story.
Today, Mehdi is the Data Engineer and Developer Advocate at MotherDuck - the first DevRel hire at a startup built around DuckDB, the fast-growing analytical database that has become the darling of the modern data stack. His job, officially, is to help engineers understand and use MotherDuck. Unofficially, he is doing something far harder: convincing people that technical work can be communicated with joy.
He lives in Brussels, Belgium - moved there from Berlin in 2025, in the quietly nomadic way that has defined much of his adult life. He calls himself a "Nomadic Dad," raising children across cultures and borders while maintaining a full-time career, a YouTube channel, a newsletter, and an ever-expanding GitHub profile. If that sounds exhausting, he would probably laugh and post a meme about it.
"The best feeling is when you burn tokens to REMOVE code."- Mehdi Ouazza, LinkedIn post with 3,043 likes
The Road Through Europe's Fintechs
Mehdi's career reads like a tour of the European startup ecosystem at its most intense. He spent time at AXA, then moved to Klarna during its most explosive growth phase, followed by Back Market - the circular economy marketplace shaking up consumer electronics - then Trade Republic, one of Germany's most-watched fintech challengers, where he reached Staff Data Engineer level.
Each stop was a different kind of scale, a different kind of chaos. Klarna's data problems are not Back Market's data problems. Back Market's pipeline concerns are not Trade Republic's. Ten years across these companies gave Mehdi something more useful than any certification: a complete map of how data engineering actually fails in the real world, and a hard-won sense of what actually matters.
His 2023 article series "10 Lessons Learned in 10 Years of Data" distilled this knowledge with the kind of honesty rarely found in technical writing. He talked about burnout, about tooling explosion fatigue, about the shift in data ownership models - not as abstract observations, but as things that had happened to him and his teams. Engineers read it and recognized themselves.
At Back Market, Mehdi worked on data infrastructure supporting the refurbished electronics resale market - a sector where data quality is existential. At Trade Republic, data pipelines run alongside financial transaction flows where latency and correctness aren't nice-to-haves. These were environments that sharpened his thinking about what data engineering really means at scale.
First In the Door at MotherDuck
In 2023, Mehdi made the jump that changed the shape of his career. He joined MotherDuck as its first Developer Relations hire - the person responsible for building the bridge between a technical product and the community of engineers who might use it.
MotherDuck is the cloud companion to DuckDB, the in-process analytical database that has become something of a phenomenon in data engineering circles. It is fast, lightweight, embedded, and has acquired an almost cult-like following. Mehdi had already been working with DuckDB before joining. He understood why it mattered. More importantly, he could explain it.
What followed was a systematic build. He wrote documentation from scratch. He launched and grew a YouTube channel that would accumulate over 100K views for MotherDuck alone. He organized meetups across Europe, bringing together hundreds of data engineers. He grew MotherDuck's social media presence by 450%. He spoke at twelve-plus events in two years. In Developer Relations, building a community from nothing is the hardest thing you can do. He did it.
"Learning should be fun."- Mehdi Ouazza's core professional philosophy
The Newsletter, the Channel, the Community
Parallel to his day job, Mehdi runs Mehdio's Tech (Data) Corner - his Substack newsletter launched in December 2022 and now reaching over 2,000 subscribers. The newsletter covers data tools, AI, technical careers, and the business of being an engineer in a rapidly shifting market. The writing is not corporate. It is direct, sometimes irreverent, often funny - the kind of newsletter engineers actually read instead of archive.
His recurring series "ctrl+r" is a weekly recall structured around three pillars: Thoughts, Tools, and Takes. Recent issues have covered AI agents, minimalist data architectures, and the career implications of the agentic shift in software. He is not chasing trends. He is trying to give engineers durable thinking in a field that changes faster than anyone would like.
His personal YouTube channel (@mehdio) has crossed 906,000 views across 114 videos - a remarkable number for niche technical content. The channel covers DuckDB tutorials, data engineering workflows, and career advice. His presentation style is what sets it apart: he moves fast, keeps it practical, and does not pretend that anything is simpler than it is.
He also founded DataCreators.Club - a podcast and community for data professionals building public audiences. It is a meta-project in the best sense: a community builder helping other community builders. He understands that the best way to grow a field is to help the people who are trying to explain it.
The Open-Source Fingerprint
Mehdi's GitHub tells you more about his thinking than any bio could. His most-starred project, pypi-duck-flow (235 stars), is an end-to-end data engineering project that analyzes Python package download data using DuckDB, MotherDuck, and Evidence - a demonstration of the modern data stack in action, built for learning, not production. It is the kind of project that teaches more than a tutorial because it is real infrastructure with real data.
His duckdb-extension-radar project (113 stars) automatically refreshes every day to catalog DuckDB extensions available on GitHub. It runs on autopilot. It is useful to the community. It took effort to build and zero effort to maintain. That is his engineering sensibility: build things that keep working after you stop thinking about them.
Across his 53 public repositories, he has accumulated 765+ stars - a number that reflects consistent quality over time, not a single viral moment.
The Nomadic Dad Thesis
There is a version of this profile that ignores the personal context entirely and just lists the professional achievements. That version misses the point. Mehdi describes himself, unprompted and in his primary bio, as a "Nomadic Dad." He has built his career while moving between cities, adapting to new communities, and raising children who are growing up across cultures.
This is not background color. It shapes everything about how he thinks. His instinct to share, to teach, to build community - these come from someone who has had to rebuild his own network repeatedly and knows that the scaffolding you build for others is the scaffolding you eventually use yourself. His career advice is not abstract because his career is not abstract. It happened to him, in specific cities, at specific companies, with specific tradeoffs.
His move from Berlin to Brussels in 2025 came with the casual announcement that has become his signature style: "Bye Berlin and Germany, Hello Brussels" - packed into a LinkedIn post that combined the personal and the professional as if there were no wall between them. For Mehdi, there isn't. That's the point.
What He's Building Next
His current side project is Subtldr - an AI-generated newsletter built on top of Reddit content. It is an experiment in automating the curation layer that newsletters typically rely on human judgment to perform. He is exploring what happens when you let language models do the distillation work, and what that means for content quality, reader trust, and editorial value. The kind of project that is interesting regardless of whether it succeeds.
His newsletter continues its march toward a larger audience. His speaking schedule remains full. His YouTube output stays consistent. And through all of it, the throughline is the same: data engineering is a career, not just a skill set, and careers need tending, explaining, and the occasional injection of humor to keep them alive.
Mehdi Ouazza is not the loudest voice in data engineering. He is one of the most useful ones - the engineer who explains things well, who shows up consistently, and who has quietly built more community than most people manage to do in a lifetime. The duck logo on his MotherDuck bio is incidental. The rest is not.