Generally, I would tell an interviewer that I have "hands-on experience" with this technology, by which I mean that my experience in this field is very limited, but quite efficient and knowledgeable.
I've had this feeling that quoting it this way does not give the correct message. It does not clearly explain the "efficient and knowledgeable" part. So how do I say it? Is there a one-word expression for it, or is there any better statement to express this?