Urgent React.js Developer Needed

I'm looking for an experienced React.js developer to work on a complex project that has an existing codebase. This is an urgent requirement, so I need someone who can dedicate sufficient time to this task.

Ideal Skills and Experience:
- Proficiency in React.js
- Experience with complex codebases
- Strong problem-solving skills
- Ability to work under tight deadlines
- Familiarity with relevant tools and libraries

Please provide examples of previous work and your availability.