I work in one of the big old industries and we commission web shops to build first versions of web apps that internal IT then takes over for maintenance and fut

I work in one of the big old industries and we commission web shops to build first versions of web apps that internal IT then takes over for maintenance and future iterations. We have standardized on Angular on the frontend and require providers to use it. The backend tech is less critical, it can be one of Java, JS, or Python and the important point is a JSON/REST interface with Swagger documentation.