Will my job have a negative impact on my profile as a graduate student applicant?
Masters degrees are often funded not by the university but by an employer.  Generally with the requirement that you continue working during your program, which constrains choice of school geographically (has to be close to the employer), the rate at which you complete a program (part-time, not full load), and only works for the degree most closely associated with the job you do -- companies don't fund you to move on to bigger and better things elsewhere, they invest in making their employees provide more value back to them.

Your job history shouldn't have a lot of impact other than whether it enables you to be employer-funded, and in the case described of working in your field but outside your desired specialization, it pretty much rules out receiving that benefit.

On the other hand, most Masters (MS, MSE, or MEng) in Engineering programs even at highly ranked schools don't have extremely competitive admissions.  So you might focus on trying to find employment (and the necessary visas) compatible with the program you want to enter.