Languages with Professional Experience

Level	Description
Level 0	Imperative or Object Oriented
Level 1	Imperative, Object-Oriented and declarative (SQL), added bonus if they understand static vs dynamic typing, weak vs strong typing and static inferred types
Level 2	Functional, added bonus if they understand lazy evaluation, currying, continuations
Level 3	Concurrent (Erlang, Oz) and Logic (Prolog)