RESTful API Development for Financial Data

I'm looking for an experienced developer to build a RESTful API. The API will be used for:

- Data retrieval
- Data submission
- Authentication

The API will interact with financial data, so experience in handling sensitive and complex data is a must.

Ideal Skills and Experience:
- Strong proficiency in RESTful API development
- Experience with financial data and security protocols
- Knowledge in data retrieval, submission, and authentication processes
- Familiarity with relevant programming languages and frameworks
- Ability to ensure data integrity and security

Please provide examples of previous work and relevant experience.