HTML/PHP Data Collection Form Development

I'm seeking an experienced developer to assist with an HTML/PHP form I'm currently working on. The primary function of this form is data collection, specifically for a data filter and download feature.

Key Requirements:
- User-friendly interface for data input.
- Robust backend to handle data processing and storage.
- Data filter options to refine the collected information.
- Download functionality in CSV format.

Ideal Skills and Experience:
- Proficient in HTML and PHP.
- Experience with form handling and data processing.
- Strong understanding of CSV data formatting.
- Ability to create intuitive user interfaces.

Looking forward to your expertise on this project!