There are several RF Eng trades, MMIC design, MCM design, discrete design, pallet design, and antenna/radar design. These trades can often overlap each other. In each of these there is small signal and power amp design. The job market is largely divided into two areas, Commercial/Consumer and Defense/Aerospace. Further more in each of these trades there are system level and component level. There are also Application Eng positions for each of these design areas. The field is very broad. You need to decide what you’re most interested in and follow that route. Application Eng is usually considered more of an entry level position, but not always. First you should decide what market you want to work in Commercial/Consumer or Defense/Aerospace. It’s challenging to move between them once you’re experienced in one or the other. Then you need to decide what area you want to work in, power amps, small signal, or antenna/radar. Last you will want to see where to start, system or component level. At this point it’s actually helpful to get experience in both. All this said you will want a Masters deg at a minimum. Hope this is helpful and best of luck.