Just like Civil services, engineers appear for IES Exams that is Indian Engineering Services. This exam is Organised by UPSC a constitutional body. To become Engineering officer you need to appear and qualify IES exams. IES is organized for most of the departments excluding few such as Chemical Engineering. So after completing your Engineering you can appear for this exam and become an officer.
You can see the ad released by UPSC for your reference at
http://www.upsc.gov.in/sites/default/files/Notification_ESE_2018_Engl_Revised.pdf
For more details visit
https://goo.gl/u7yjKS
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