Hello Aspirant

Overall based on the outcomes of your course in any of the phases of your life you need job  experience in order to achieve promotion in work field. So yes you can choose a job in your upcoming 2-3 years to achieve your best career perspectives. Whereas at the same time having a M.TECH degree is beneficial over B.TECH. Hence even if you opt for a job after few years you need to prepare for GATE and pursue your M.TECH, however on the basis of the current scenario having a B.TECH+M.TECH degree will not be that useful, rather choose a job of your field of choice and gain experience.

Hope it helps!!!