"if one team of the car factory figures out how to produce door handles much faster, it is wasteful and counter productive to accumulate door handles while other parts of the production chain can’t keep up. You need to look at the system as a whole. "

"As an org grows, complexity increases to a point when nobody can have a clear picture of how things works. Every time you change something, you break something. That incentivizes adding more to the pile of increasing complexity" Bottom up Architecture: sympathetic.ink/2025/02/13/Bot…

Please follow me over there instead: bsky.app/profile/julien…

🚀 Proudly presenting our next stellar speaker. Julien Le Dem is a Principal Engineer at Datadog, Inc., an officer of the ASF, and a member of the LFAI&Data Technical Advisory Council. He co-created the Parquet, Arrow, and OpenLineage open-source projects and is involved in several others.

🚨 New Video Alert! 🚨 The #icebergSummit agenda is full of great sessions, like this one from Julien Le Dem on "The Advent of the Open #dataLake." Watch along below to get a summary of the session and a glimpse into how #apacheIceberg evolved into what it is today.

🎙️ We’re honored to welcome Julien Le Dem (Datadog, Inc.) to AI By The Bay. With a track record of shaping key technologies like Apache Parquet, Julien Le Dem brings deep experience and clarity to one of the most important shifts in data architecture today: the rise of the Open Data Lake. 👇

I’m looking forward to presenting a keynote at Data Council this year. I’ve been sharpening my slides and thinking of witty things to say. It should be fun! datacouncil.ai/talks25/keynot…

Day 3 of Data Council #DataCouncil kicking off with a keynote by the awesome Julien Le Dem : The Deconstructed Database and the Advent of the Open Data Lake

The keynote by Julien Le Dem in the evolution of big data at Data Council — and he is also an invited speaker at AI by the Bay in the same venue in November as before!

decoupled. composed. open. unsiloed. happy. flourishing. Kicking off Day 3 with Keynote "The Deconstructed Database and the Advent of the Open Data Lake." Julien Le Dem (Principal Engineer, Datadog, Inc.) shows how cloud-native architectures and open data lakes are powering flexible,

"More than Query - Future Directions of Query Languages, from SQL to Morel", a conversation with Julien Le Dem about Morel based on the talk I gave at Data Council youtu.be/zpdbEvhhne8?si…

The recording of my keynote at Data Council 2025 is now available. If you missed my best talk so far, you can now catch up. The Deconstructed Database and the Advent of the Open Data Lake bsky.app/profile/did:pl…

Julien Le Dem (Julien Le Dem) : L’avènement du Lac de données ouvertes ✨au Apache Iceberg #Paris Community Meetup #1 🗓️Le 19 Juin à ⌚️18:00 🗼chez Criteo , 32 rue Blanche - 75009 Paris inscription : meetup.com/fr-FR/iceberg-… #datalake #datalakehouse Apache Parquet OpenLineage

Quite a list of contributors already to the Rust Apache Parquet implementation of Variant (support for semi structured data). I was making some slides to explain what Variant is and made up a list I wanted to share. The feature will be amazing github.com/apache/arrow-r…