This paper presents the results of a series of semi-structured sociolinguistic interviews conducted in person between Informatics teachers and the researcher. The researcher is a fifth year university student of linguistics and all of the respondents are Informatics teachers in primary schools in the Krapina-Zagorje County in Croatia with more or less subtle variation in their age, education, place of work, and teaching experience. The study examines the respondents’ opinions, ideas and attitudes about the use of language in teaching Informatics and the influence of various language ideologies on their perspectives on language. This research shows that even though the respondents are aware of the presupposed importance of the standard dialect in formal education, most of the respondents use and allow the use of regional and local Kajkavian dialects in teaching and learning because they feel that their students are able to express themselves more efficiently in their vernacular, rather than in the standard dialect. Apart from allowing code-mixing between standard and non-standard Croatian, the teachers also explain their points of view on code-mixing between Croatian and English. They state that they use both English and Croatian equivalents of certain words, but nevertheless they frequently encourage their students to use Croatian words.