This piece is a community contribution from Denis Arnaud, Principal Engineer at Decathlon Digital, written in collaboration with resident authors of MD101. At the intersection of engineering excellence and long-term data strategy, Denis contributes to foundational projects and introduced technologies like data contracts, SQLMesh, and data life cycle at his organisation. Denis is a true data community champion with his consistent contribution to open initiatives such as Data Engineering Helpers and the Fedora Project. We’re thrilled to feature his unique insights on Modern Data 101!We actively collaborate with data experts to bring the best resources to a 10,000+ strong community of data leaders and practitioners. If you have something to share, reach out!🫴🏻 Share your ideas and work: community@moderndata101.