Backend engineer (part time) needed for mobile app

We are seeking a part-time backend engineer to work on our mobile app. The ideal candidate should be proficient in Node.js, as this is the preferred programming language for the project. Our team has already created wireframes and mockups for the mobile app, so the backend engineer will be working with these designs. We are currently unsure about which type of database to use for the app, so we would appreciate recommendations from the engineer. The front end will be build using React Native

Skills and experience required:
- Proficiency in Node.js
- Experience working with wireframes and mockups
- Knowledge of databases and ability to make recommendations

This is a part time role (8-10 hours a week)
Time zone: Eastern Europe