Web game backed by ETH smart contracts

I want someone or a company to help me build my collective gambling game backed by ETH smart contracts. The game is about betting on one side of the equilibrium (think as left/right sides or A/B sides), and at the end of a specific period, the winning side (which has the most money collected) will collect all the money they have bid, plus the losing side's bids. House share starts from 1% and goes higher up to 50% near each round. The backend consists of scheduled jobs to start bidding, trigger the smart contract(*), and provide an interface/API to the frontend side; to let the front end show the winning side, ongoing bids, etc. I think that the smart contract I need will not be super complicated. But still, if you only have experience with ICO type of smart contracts, you might have a hard time delivering the output; therefore, I require experience with complicated smart contract projects. I prefer to have this project over the ETH network, but I am open to other crypto technology as long as it serves the purpose. Essential backend functions are; 1- to start a new game with variables, 2- store game results, 3- provide API, and feed the frontend. You are free to choose your favorite development language to deliver it. On the frontend side; I don't expect a fancy website; it will be most likely a 2-3 pages website where we have the "game" (to show the ongoing round, previous rounds) and "FAQ" pages, as well as a user profile page where the user can see the results of previous bids, the money he gets from the referrals, etc. There will also be a basic admin page, where we can set rounds to start, edit them in bulk, change jackpots, etc. More information will be shared with the successful bidder.