What will be expected of this programmer? What skillset does this programmer need to have? What kind of maintenance is required by him/her? How many estimated hours a month?
Last question: What the freak
is wrong with your business model that you are only turning revenue of £400 a month with BILLIONS
of players playing the game??!?!? If you sold a game mechanism that gave a small advantage to a billion players for just £1/month, and only 1/10th of 1% of the players bought this advantage, you would be turning over £1,000,000/month. Could it be that you are *gasp* exaggerating the popularity of this game? By about 999,999,998 players?
p.s. you might want to get someone to edit this Wikipedia page and add your game to the list: