Image Superimposing Software Development

I'm in need of a software that allows me to superimpose a grid over any given image.

Key Features:
- Adjustable Grid Size: The software should allow me to change the size of the grid according to my needs.
- Image Transparency Control: I need to be able to control the transparency of the image, so the grid is clearly visible.
- Zoom Functionality: It's important that the software includes zoom functionality to facilitate close inspection of the superimposed image.

Compatibility:
- The software will need to be compatible with Windows and macOS operating systems.

Ideal Freelancer:
I'm looking for a developer with experience in creating software solutions that involve image manipulation and user interface design. Skills in software development for both Windows and macOS are a must. It's also important that you have a good understanding of grid systems to ensure the software's effectiveness.