Need a developer to refine someone elses code in 3 points

[VydyNet]
Services to finalize the sites - the correction of errors, the acceleration operation, CLEANING OF VIRUSES, parsers, API. Connect any payment system to any site system. PHP, MySQL, JavaScript, IOS, Swift. Completion of any CMS for the site. Any complexity. Website: https://Vydy.Net Telegram: https://t.me/vydynet