HeyJaredAndrew Jones
Principal (Data) Engineer. Coined Data Contracts. Father of 2. Brewer of beer.
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- Sep 25, 2026
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The draw of open storage formats (opens the original)
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Hey, hope you had a good week! I was at Big Data LDN for day 1 and it was great to meet some of you!On to the newsletter and this week I write about the draw of Iceberg. There’s also links to articles on real-time personalisation, shifting from imperative to declarative, and dbt-contracts.The draw of open storage formatsThere’s been a lot of talk about Apache Iceberg over the last year or so, but beyond the tech what’s the draw of an open storage format?One often quoted benefit is to avoid vendo
Schema-on-read vs schema on write: It's about the costs (opens the original)
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Hello 👋In this week’s newsletter I look at the costs of schema-on-read vs schema on write.There’s also links to articles on an AI-ready warehouse, modelling and semantic layers, and where data goes.Also, I’ll be speaking at the Compass AI & Tech Summit on the 1-2 October in Budapest. Let me know if you’ll be there too! And if you want to join, use the code AndrewSentMe for 20% off :)<s
How to frame data contracts (opens the original)
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Hello 👋In this week’s newsletter I write about how to frame data contracts to different audiences.There’s also links to articles on graphs in practice at Netflix, ODCS v3.2.0 and ODPS v1.1.0 release, and asking is the data catalog finally dead.How to frame data contractsPeter Baumann asked this question on in a Substack note yesterday, and it got me thinking about how I pitch data contracts:How I pitch data contracts depends entirely on who I
Increasing data accessibility (opens the original)
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Hello 👋 Sorry for the lack of newsletter recently, I’ve been on holiday (Southwold 🏖️) and then lots of childcare as we came to the end of the summer holidays leaving very little energy for writing about data!I’m back now and this week writing about how we increase data accessibility.There’s also links to articles on RAG architectures, LLMs in search, and agentic data.Increasing data accessibilityOne of the key goals of a data team is to increase the amount of access
What is ownership? (opens the original)
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Hey, happy Friday!In this week’s newsletter I write about what ownership is (it’s complicated!). There’s also links to articles on closing the context gap, getting your data team a seat at the table, and creating data & AI use cases.What is ownership?Ownership is a complicated thing.Often people are assigned ownership, for example by having their name listed as such in a spreadsheet or policy document.But is doing that enough to make them an owner?Do they understand in enough detail what they ar
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