Web App Penetration Testing

I'm seeking a skilled penetration tester to identify vulnerabilities in my web application. The focus will be on:

- Authentication mechanisms
- Data input fields
- API endpoints

Ideal skills and experience:
- Proven penetration testing experience
- Expertise in web application security
- Familiarity with OWASP guidelines
- Strong analytical and reporting skills

Please provide a detailed report on any vulnerabilities found, along with recommendations for remediation.