Hi,
First of all, although I never accomplished such a project, the challenge interests me a lot. I am myself a gamer, so this kind of job is more appealing to me than another "Wordpress plugin customization".
Second, I would need more details, but I think your application would heavily rely on a database. I am fully qualified to set up a PostgreSQL database with a thick architecture, so that it will be efficient on both the process speed and the data integrity. Most of the job would then be done by the RDBMS, which is fast and easily portable. I may also provide scripting in various languages (C, bash, python...) as necessary, besides a front-end in PHP/HTML I guess.
But I am simply guessing, I checked both websites and it seems pretty straightforward, but I would need to know more about it.
Looking forward to get some news from you,