Pentesting related to national security or gov work can pay really well with a clearance (and the workload can be really light). I don't know if the private sector does pentesting pay better than engineering pay.
I found most of the pentesting salaries came in lower than engineering ones, and I felt that pentesting was the more difficult job.
I found most of the pentesting salaries came in lower than engineering ones, and I felt that pentesting was the more difficult job.