spicyayam wroteYou can get multiple entry business visas which are valid for 12 months, but each stay is a maximum of 60 days. That would probably suit your situation best.
Agreed, that is a good solution. Also, do note that if you spend at least 183 days in Indonesia in any 12 month period (i.e., this can be over two years), you will become liable for Indonesian personal income tax on your worldwide income.