The most extensive process was qualifying for the position. Applying online and getting rated as a GS-5 was most time consuming. Take a federal resume workshop, they will help you word your resume as accurately as possible. The website uploads your rating and matches your resume to the position. After all candidates are reviewed, and all requirements met, it is rare to have a formal interview since that narrows the pool. You WILL be interviewed but mostly it is basic work experience and questions about your skills and abilities.