Because orderbook based exchanges are not exactly trivial to implement with all necessary security what you are asking is unlikely to happen in business-wise. Even with the best software developers of the world you could not achieve what you wish within a week or so.
If you have plenty of money to invest and you want hiqh quality, long-term, results for your project, what you should expect
Lead development time of 2-3 months with 2-3 person team with the following components
A way to get fiat currency in and out from your exchange (you probably should have a special deal with a bank)
If you are using western world senior software developers, expect cost between 25 k - 100 kUSD
Based on how you set the question it seems that you do not have much experience with software development, so my suggestion is that you hire a project manager who would do the planning for you.