We can implement your on-premise ETL processes based on Talend ESB free open source integration platform.
Talend ESB ETL Development
We can develop your ETL processes based on Talend ESB.
In this process we can setup Runtime ESB on your on-premise server and create Talend Open Studio (TOS) for ESB based ETL processes on it.
Of course we document and save and store all processes so that you can at any time take over the development and start to develop and maintain those on your own if you want.