Custom Data Entry Software Development

I need custom data entry software to handle mixed data types (text, numerical, and other formats). The primary input will be from importing existing files, not manual entry or real-time feeds.

Key Requirements:
- Support for importing CSV, Excel, and JSON file formats
- Privacy-oriented design and implementation

Ideal skills and experience:
- Experience in developing data entry software
- Proficiency in handling mixed data types
- Strong background in file import functionality, especially CSV, Excel, and JSON
- Knowledge of privacy standards and implementation

Looking for a reliable developer who can ensure data security while delivering a robust solution.