Don't really know about Oracle-the-company, but everything I've heard about Oracle-the-database-product suggests that working on it is a nightmare. e.g. https:

Don't really know about Oracle-the-company, but everything I've heard about Oracle-the-database-product suggests that working on it is a nightmare. e.g. https://news.ycombinator.com/item?id=18442941 https://news.ycombinator.com/item?id=18442941