Position: Разработчик Oracle PL/SQL
Category: SQL
English level: intermediate
Years of experience: 11

Have good knowledge of SQL and PL/SQL optimization.
Understand what is CBO and how it works. When and how it used objects statistics. How data distribution and the "clustering factor" affect performance and execution plan.
Study Scala programming language.
Big projects for the Russian government (Ministry of Health, Finance). Enterprise. Database development from scratch. 
Reporting from DB. 
I have improved the big analytical system by moving the cube(table) (3Tb) into small tables (200-500 tables). 
Benefit: full calculation reduced from 30 hours to 5 hours. Used disk space reduced from 3Tb to 1Tb.

Using and know how to use it: tables( heap organized and IOT), partitioning (tables and indexes), triggers, views and materialized views, PL/SQL in all aspects, impdp/expdp. Have DBA knowlege.
Have OCA certificates in PLSQL and DBA.
Don't like Enterprise systems, when external customers change tacks often - sometimes multiple times in a day.