My job included technical support for the ETL team of a large German e-commerce provider for electronic items; the ETL infrastructure consisted of 300 to 400 ETL jobs. On the one hand, I was responsible for creating, changing and optimizing ETL jobs using Talend Studio DI, and on the other hand for planning ETL processes and prioritizing tasks for a team of up to 5 employees. In the 5 years in the project three different Talend versions (5.3.1, 6.2.1, 7.0.1) were used. When upgrading the Talend Studio versions including the associated infrastructure components (Talend Administration Center, Nexus, git / SVN), I took over the technical coordination of the necessary steps in coordination with internal and external employees. A central database with a size of approximately 2 TB was used to combine the data from various source systems; until 2017 it was an Oracle database in version 11g R2, after that the database was migrated to PostgreSQL 9.6 and ETL infrastructure was transfered to the cloud (Google Cloud Platform using "Cloud SQL" for the database and VMs for the infrastructure components).