on what platform can we find relevant immediate candidates for the job openings.
You can try registering and searching on https://www.ncs.gov.in/employer/Pages/default.aspx
Try Indeed jobs and Hirist.com which allows free job posting.
Try for linkedin, iimjobs,hirist,updazz,hirect. These are all free of cost platforms.
Try first LinkedIn, you will immediately get good responses but make sure you have put right skills set to filter out the candidates.
It is free for one post only with limited responses. Then you can go with paid posting with multiple job posts where you need to add company card details.
If the position is technically then at same time you can post on hirist portal as well. It’s free.