Complete Secure

I am looking for an experienced Full-Stack Developer to complete an existing web platform for young handball players. Current Status: Website already developed (HTML, CSS, JavaScript). Website is online and hosted on Hetzner. Database is set up separately on Hetzner. Domain email addresses are configured. Existing desktop design must remain unchanged. Tasks to Complete: Connect registration forms to the database. Implement secure user registration, login and email verification codes. Allow parents to register and manage profiles for multiple children. Implement automated registration confirmation emails. Send copies of parental consent forms by email. Implement GDPR-related privacy, consent and account deletion features. Develop a secure admin dashboard. Ensure secure communication between website, backend and database. Test all functions, fix bugs and improve security. The platform must maintain the current design while completing the registration form. Integration with WordPress is acceptable if needed to achieve functionality.

Requirements

Experience with backend development, databases and Hetzner hosting. Experience with secure authentication and personal data protection. Ability to work with existing code without rebuilding the website. Important: This is not a new website project. I need someone to finish and connect the existing components. Please provide your estimated fixed price, completion time and relevant experience.