I'm experienced Delphi Developer, working since 1996 with Pascal and Delphi.
I have done a variety of DLL during my career and I well understand the API conventions and what any program using this DLL will expect to it, for example, a smooth integration with other languages (if that's part of your requirement) by avoiding specific Delphi data types.
I'm Embarcadero MVP since the program start in 2012.
I'm Firebird user since it's fork from Interbase, and I still maintain projects running against the latest versions of the engine.
Don't hesitate to contact me anytime if you want to discuss any further details of the project.
Kind regards.
ps. No escribo portugués, pero si Espeñol, si eso facilita la comunicación.
Un saludo.