Marketplace Platform Development Fix and Secure

I'm looking for an experienced developer to review my map-based, multi-featured marketplace platform built on Bolt (vibe coded). The platform has some final issues that need to be resolved to ensure a smooth and secure user experience.

Key tasks include:
- Making it mobile friendly
- Fixing user interface bugs
- Resolving performance problems
- Addressing security vulnerabilities
- Correcting database issues
- Cleaning up messy coding

Ideal skills and experience:
- Experience with Vibe or similar platforms
- Strong UI/UX debugging skills
- Performance optimization expertise
- In-depth knowledge of security best practices
- Solid database management and coding skills

I have a budget of 20 - 250 GBP for this project.