Secure Childcare App for Launch

Hello, I have an existing application that is mostly developed, and I’m looking for professional assistance to review, secure, and prepare it for launch. I am not looking to build a new app from scratch. The frontend, core features, user workflows, and much of the backend are already in place. My priority is making sure everything works properly, is secure, and is ready for real users. The application is in the childcare and babysitting services space, so protecting personal information and ensuring user safety are especially important. I am looking for assistance with: - Reviewing the existing code and application architecture. - Auditing backend security, Firebase, database rules, authentication, and user permissions. - Ensuring sensitive information and uploaded documents are stored securely. - Identifying and fixing bugs, errors, and broken functionality. - Reviewing payment and identity verification integrations. - Testing all major user workflows and administrative functions. - Checking mobile responsiveness and overall app performance. - Preparing the application for production launch. I would like to preserve the existing codebase and functionality wherever possible rather than rebuild the application. Could you please let me know what your review and development process includes, and whether you provide actual bug fixes, backend improvements, security enhancements, and testing as part of the service? I would also appreciate a final report outlining completed work and any remaining issues. Thank you. I look forward to hearing from you.