WordPress Security Expert Needed — Persistent Cloaked Spam Injection (Urgent) - Project

My WordPress site has a recurring malware infection that injects hidden, cloaked spam links into a subset of published articles. This is a repeat infection — a previous, different malware issue (backdoors, rogue admin accounts, fake plugins, cloaking injector) was fully remediated a few months ago... (Budget: $30 - $250 AUD, Jobs: Web Security, WordPress)