API Integration for Data Retrieval

I need an experienced developer to create an API link that retrieves data from both our internal database and a third-party service. The API should be able to handle all data in JSON format.

Key Requirements:
- Expertise in API development
- Familiarity with data retrieval processes
- Ability to work with internal databases and third-party services
- Proficient in handling and formatting data in JSON

Ideal Candidate:
- Has a strong background in software development with a focus on API integration.
- Excellent problem-solving skills and attention to detail.
- Able to deliver high-quality work within the agreed timeframe.