Who was responsible for developing database schemas in your project?

In projects, responsibility for designing database schemas usually lies with data architects, database developers (DBA), or backend developers, depending on the team structure.

If the project is small, developers who write server-side logic often design the table structures and relationships themselves. In large projects, there may be a dedicated role — a database specialist who handles normalization, optimization, and schema maintenance.

For example, in my practice, the backend developer discussed requirements with the architect, after which the backend developer created migrations for the database, defining tables, fields, and relationships.