Welcome to the community, @ARCO_Singapore!
Interfaces are only for use with internal collaborators.
If your contractors are using desktops or laptops, you could share a view with them, and they can search the view:
However, note that shared views do not work properly on mobile devices because they are missing the search function and many other functions. This is one of Airtable’s biggest flaws.
If you need a mobile shared view that they can search, you would need to pay extra for an external service to do this for you, such as MiniExtensions: