Ivan Karadza is working at the Bible Institute as the Director of Online Studies, and he oversees children and teen Bible distribution for Croatia.

In the Church of Christ of Kuslanova, Zagreb he serves as the Sunday school (catechism) representative to the Croatian government. Ivan also oversees organizing and executing the yearly schedule for Sunday school for his church. His wife, Marina, teaches Sunday school to 1st-4th grade children, and Ivan teaches 5th-8th grade children as well as high school students.

Marina also takes care of organizing the educational environment for the early childhood development of the children who come to their church, while Ivan also has the responsibility of all benevolence/humanitarian efforts in their church. In September 2018, Marina and Ivan started hosting English classes in their home for children from their neighborhood. They have had two groups, one for younger and one for older children.

In autumn of 2020, they became leaders and organizers of Bible studies for young married couples and began doing pastoral work for couples and their children.

Ivan and Marina have four children: Ika, Iris, Matej, and Vito.