Brightening Facial Serum Formulation

I'm looking for an experienced formulator to create a facial serum. The primary goal of this serum is brightening, and it should be suitable for combination skin.

Key Requirements:
- The serum should be effective in brightening the skin.
- Formulated specifically for combination skin.
- Use of high-quality, skin-safe ingredients is a must.

Ideal Skills and Experience:
- Background in cosmetic chemistry or formulation.
- Experience in creating serums, especially for combination skin.
- Knowledge of effective brightening ingredients.
- Ability to provide a detailed ingredient list and usage instructions.

Please share your relevant experience and approach.