From Timișoara city center to Dumbravița city center is only a 15 minutes ride.
You can get from any part of Timișoara to Dumbrăvița using the public transportation network. You can pay by electronic tickets or direct using you contact-less debit/credit card. You can pay your trips using a smarptphone app. You can also get the transport timetable using a smatphone app. You can download the transport network map here.
Here is a map for the Electric public transport network (just an example, download the full pdf maps from the link above).