The phrase "proven expertise" means having demonstrated knowledge, skills, and experience in a particular field or subject. It signifies that someone has successfully shown their capability and proficiency in a specific area. Full definition
SUMMARY * A senior engineering professional with proven expertise in software, hardware, firmware design and product development in the electronic industries. (members.climber.com)
As a personable, efficient, and highly organized professional with proven expertise in general administrative support in medical settings, I am prepared to significantly contribute to your office's goals and objectives. (jobhero.com)
It is globally recognized for its unique work philosophy, brilliant teams, and proven expertise at creating amazing games for personal computers, consoles, tablets and mobile platforms. (rollercoastertycoon.com)