Backend & Database Development for Frontend App

I need a skilled developer to build a backend and database for my frontend application.

Key Requirements:
- User Authentication: Implement secure login/signup functionalities.
- Data Storage & Retrieval: Set up efficient data management.
- API Integration: Connect with necessary third-party APIs.

Database Preference: I'm unsure between SQL and NoSQL, so I need guidance on the best choice.

Ideal Skills and Experience:
- Proficiency in backend frameworks (Node.js, Django, Ruby on Rails)
- Strong database design skills
- Experience with API integrations
- Knowledge of security protocols for user authentication

Looking for someone who can provide a robust and scalable solution.