I am in need a Solana rust developer urgently

Hi, I am looking for a Solana rust developer who can build custom smart contract. since its startup project, I can't give you much. total budget will be $500. If you are not affordable, don't waste my and your time. Please check attached requirement and let me know. I only need rust code. (No UI required). If you can do it within 1 week, please contact me. thanks.