John Doe has extensive experience developing a variety of applications and systems across multiple industries. Some of the key projects in his portfolio include: 1. Developing ETL processes using Talend to handle large quantities of data from a retailer in a Big Data AWS environment. 2. Implementing monitoring components on WebSphere Portal for Woolworths to track call center response times, effectiveness, and efficiency connecting to Oracle and SQL server backends. 3. Building the backend and structures for an application handling over 288,000 electricity meter records per day for Terra Firma allowing customers to view usage and bills.