Convert Colored Logos to Monochrome PNG

I need a designer to convert 50 colored logos into monochrome PNG versions.

Requirements:
- Change to specified monochrome colors (certain grey hex codes)
- Retouching or refining
- Resizing as needed

Ideal Skills and Experience:
- Proficient in graphic design software (e.g., Adobe Illustrator, Photoshop)
- Experience with logo editing and modification
- Attention to detail and color accuracy

Please provide samples of previous logo work.