[samat]

Self learning is one thing and being completely on your own without a way to ask specific questions on the daily basis is totally another.

If there is no one to answer your questions in your company - try and find some buddies on the internets or even change company, as in my experience, ability to ask stupid questions and get answers quick is crucial in learning programming. StackOverflow is good, but not quick enough.

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Ouch, sorry, misunderstood your question. I am not sure there is a book on best practices on APIs, but it’s definitly possible to have someone experienced help you as a company. There are good developers with experience doing this type of contractor work.