Drupal Developer for Web App Maintenance

I need an experienced Drupal developer to maintain my ongoing web app. The primary focus will be on bug fixing, particularly performance problems.

Key tasks include:
- Fixing performance-related bugs
- Improving app responsiveness and stability

Ideal Skills:
- Extensive experience with Drupal
- Strong debugging and optimization skills
- Familiarity with performance monitoring tools

Please share your experience and approach.