ReactJS/NodeJS Bug Fixing and Optimization

I need two experienced ReactJS developers or one ReactJS plus one NodeJS developer to enhance an existing application within 20 days.

Key Tasks:
- Bug fixing, especially related to API integrations and management screens
- Performance optimization

Ideal Skills and Experience:
- Proficiency in ReactJS and NodeJS
- API integration experience with third-party services, internal services, and payment gateways
- AWS familiarity
- Strong software development background
- Deep understanding of SOLID principles

Please provide examples of similar work and your approach to handling these enhancements.