TRI-ING d.o.o. Maribor is rated 3 out of 5 in the category information technology and services. Read and write reviews about TRI-ING d.o.o. Maribor. Our roots date back to 1989 when we registered as one of the first private companies for software development, first in Yugoslavia and later in independent Slovenia. To date, we kept the form of a small family business, which always listen carefully to each business partner and find the best solution to his way of doing business.