Hello,
First of all nice to meet you!
My name is Vladimir and I am from Sofia, Bulgaria, I am 30 years old and am working with the betfair API for 5 years
I started to work as freelancer after meeting my first client, he was from Australia and was doing some serious arbitrage betting which was fully automated by me. He/we were trading on the betting exchanges (Betfair and Betdaq) while at the same time some hedge bets were placed in few online bookmakers programatically (the second part of the project is exactly like the thing that you have specified). I was permanently extending that project. Exactly like the things that you are explaining... In the beginning of the third year my client decided to move to the stock and currency exchanges and then I started to create trading strategies in C# for him. The betting project was using postrges database.
During that time I was working on more than 15 other "small" project which were placing bets through the Betfair aPI, some of them were fully automated other were having UI.
In the middle of 2011 I have met (online) an arbitrage betting team from UK and they became my second long term client. I am still working with them! I have implemented automated betting modules for around 15 bookies - willhill, skybet, coral, bet365
I can explain you much more and show you screenshots later.
I will be happy if you contact me, I am sure that I am the developer that you need.
Best wishes,
Vladimir
P.S.
The price depends on the specs