SQL & PL/SQL

I've been developing for many years in pl/sql and c-shell scripting (Unix) for managing ETL processes in order to load and perform data into databases and data warehouses.
Even if I've rarely used tools like Pentaho and never used Oracle Warehouse Builder, according to you is it possible to claim that an analyst/programmer has developed ETL processes only by using classic developing (plsql, c-shell, external tables, ...)?
For a forthcoming new project I'd like to work for as a data warehouse analyst/programmer for ETL processes, I'd like to know whether I can claim to be able to write ETL procedures even if I don't use data integration tools.
Thank you very much!