Without posting any budget you are more or less going to get spammed by DMs from newbies with no prior work experience.

If you are serious about this, then I suggest you open a thread in "Services" like @Zedpastin suggested, provide a little bit of details of what your background is why you want to build a new exchange, in short what new service do you offer to the table when already hundreds of other exchanges are also running.

Make sure to provide budget details, mode of payment, open positions and possible timeframe of launch.

Only then you will get some legit applications.