Reusable ASP.NET Core SME Foundation — Users + Clients + Vehicles

I am looking for an experienced C# / ASP.NET Core developer to build a production-quality REUSABLE CORE V1 that will become the starting point for multiple future SME client applications. This is NOT a prototype or generic CRM template... (Budget: €250 - €750 EUR, Jobs: .NET Core, API Development, C# Programming, Database Management, Documentation, Git, JavaScript, PostgreSQL, Software Development, Web Development)