App & Website Quality Assurance and Bug Fixing

I'm looking for a professional to conduct a thorough quality check on my soon-to-launch Android app and its corresponding website. The assessment should focus primarily on usability, performance, and security.

Key Responsibilities:
- Identify and report bugs in both the app and website
- Evaluate usability and suggest improvements
- Test performance under various conditions
- Assess security measures and recommend enhancements

Ideal candidates should have:
- Proven experience in quality assurance for mobile apps and websites
- Strong knowledge in usability, performance, and security testing
- Excellent attention to detail
- Ability to provide constructive feedback and suggest improvements