You can either apply to PSUs and take up GATE exam. Post GATE exam if you meet the cut off criteria of GATE score you will be called for interview. Another way is to apply through state exam for posts under state government, in case of posts under state government you will have to wait for vacancy notice that is released by various departments, thereafter you can apply for those vacancies based on the fact that you are meeting the eligibility criteria. The eligibility criteria is subject to change based on application pool.