The phrase "has extensive experience working" is correct and usable in written English. You can use it when you want to indicate that someone has thorough experience with a particular task or skill set. For example: "The new manager has extensive experience working in customer service, so she is well-equipped to handle any customer issue that arises."
Dougherty has extensive experience working directly with investors to execute highly successful turnarounds of troubled companies.
She has extensive experience working with infants, children and teenagers with medical complexity.
She has extensive experience working with children and families specializing in behavioral difficulties and parenting stress.
MATT MURPHY, who has extensive experience working on Long Island, is the new executive chef at the Ram's Head Inn on Shelter Island.
Magda has extensive experience working in the area of gender justice with a special focus on engaging men and boys in promoting gender equality.
Joe has extensive experience working with large local and national membership organizations that face the challenge of successfully combining democratic governance with programmatic effectiveness.
Successful applicants will have extensive experience working in the NHS and influencing practice.
I have extensive experience working with female skaters (as well as dancers, gymnasts and horseback riders).
Like many Hoover fellows, Lin and Zegart have had extensive experience working in government themselves.
She has had extensive experience working with individuals with mental illness and developmental disabilities in inpatient and outpatient settings.
Mr. Carter said that Dr. Davenport, a native of Lansing, Mich., had extensive experience working with children, aside from his financial credentials.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union