Define and document API specifications, endpoints, data models, and protocols. Design, develop, and implement APIs using Java and Python. Integrate APIs with internal and external systems. Write and maintain unit, integration, and end-to-end tests for APIs. Create and maintain clear documentation for API consumers. Implement and maintain authentication, authorization, encryption, and security best practices. Monitor and optimize API performance, scalability, and reliability. Manage API versioning. Collaborate with developers, architects, QA engineers, and stakeholders. Provide ongoing support and troubleshoot issues.