Secure & Optimize App Suite

I have built several connected apps on the Lovable.dev platform, each tied to a shared client CRM/Portal. The front-end experience is in place, but I now need a specialist to tighten security, strengthen... (Budget: $25 - $50 USD, Jobs: Android, API Development, Backend Development, Database Management, Java, MySQL, PHP, SaaS Development, Security, Security Auditing)