Set Up & Link Social Accounts

I need my presence on Facebook, Instagram and Twitter fully aligned. I already hold log-ins for some of them; you will confirm what exists, create any missing profiles, then wire everything together so that a single post automatically publishes across the three networks... (Budget: $250 - $750 NZD, Jobs: Automation, Content Strategy, Facebook Marketing, HTML, Instagram Marketing, JavaScript, PHP, Social Media Management, Social Media Marketing, Twitter Marketing)