Hello,
How are you doing today?
I have gone through your requirements and I can surely assist you on this.
We are a team of professionals capable enough to work on any level of customization on an existing system or even work from scratch. We have been into web and mobile app development since last 5 years and would be happy to work with you.
We have a very good success rate, you can check our reviews to verify.
We can discuss your requirements further over a small chat.
Thanks,
Patrick