Lead Capture Integration on Existing Website

I need an expert to add an application to my existing website for capturing business leads. If successful, I look forward to adding the right freelancer as an ongoing backend developer.

Requirements:
- Capture contact information (name, email, phone) business EIN, CLIENT SS, WEBSITE, TIB, ETC
- Store leads in a way that is secure and prevents spam (CAPTCHA)
- Ideal skills and experience:
- Web development proficiency
- Experience with lead capture tools
- Knowledge of security measures and integration