Spanish Localization Proofreader for Mobile App

I need a proofreader experienced in Spanish localization to help with the English to Spanish translation of a mobile app. The content is currently not translated. Essentially, your role would be to ensure that the formal tone and style is consistent across all text-based instructions as well as user interface elements and in-app messages.

Ideal skills and experience:
- Native Spanish speaker with excellent command of English.
- Proven experience in proofreading and localization.
- Familiarity with mobile app content.
- Ability to maintain a formal tone and style.