Senior software engineer focused on C, C++, STL, SQL. If it ever hoped to manage data, I've probably used it, enhanced it, and optimized it.
I've used every kind of dbms dreamed up over the last 25 years, and wrote a couple of my own. A temporal database, and an In-Memory database.
Have used Hierarchical, Network/BOM, Relational, Object, Object-Relational and even Informix back when it was just an ISAM. Currently focused on complex, real-time watch-dog apps using C++ and the STL for a telco.