PDF Editor Development

I'm seeking a skilled developer to create a user-friendly PDF editor. The software should ideally support functionalities such as text editing, image insertion, and form filling. It should be compatible with major platforms like Windows, MacOS and Linux. Security features like password protection, digital signatures, and encryption would be a plus.

Ideal Skills:
- Proficient in cross-platform software development
- Experience with PDF manipulation libraries
- Knowledge of implementing security features in software

Please provide examples of similar projects you've completed.