Data contracts are tools that are gaining strength in the data engineering practice, used to enhance data quality during data ingestion. This thesis aims to establish a format specification for contracts and the associated system for enforcing these agreements, particularly targeting source-aligned data products in the context of a data mesh paradigm. This research addresses the pressing need in contemporary data engineering to maintain data quality amid an increasing production of data, proposing a proactive approach where data producers adhere to predefined quality standards at the source. For this purpose, an application was designed to manage and validate contracts, using a push-based data ingestion as the examined scenario.