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arXiv · 2607.13339

Not Your Usual Type(s): Data contracts as types across languages and engines

Aldrin Montana·Colin Marc·Luca Bigon·Jacopo Tagliabue
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Abstract

Composable data systems promise to let developers combine languages, engines, and catalogs without sacrificing a coherent user experience. In practice, however, pipeline-node boundaries remain weakly specified: transformations exchange tables through schemas that are often checked late, enforced unevenly across languages, and disconnected from the semantics business users care about. Based on over a year of operating millions of jobs in Bauplan, we share the design principles behind our new SDK, which treats data contracts as types for a composable, multi-language lakehouse. Users, whether humans or agents, annotate input and output tables with schema objects that encode column types, constraints, documentation, and lineage; Bauplan then interprets these annotations at different points in the execution lifecycle. We show how this design addresses common production failures, and how an ''everything-as-code'' philosophy enables both deterministic and non-deterministic reasoning over data flows across languages and engines.

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Aldrin Montana, Colin Marc, Luca Bigon, Jacopo Tagliabue. 2026-07-14. Not Your Usual Type(s): Data contracts as types across languages and engines. https://arxiv.org/abs/2607.13339

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