Spring Boot API Functional Testing

I have a Java application split into two Spring Boot services: • a web-based backend that exposes REST APIs over MongoDB • a standalone CLI client that consumes those endpoints I need thorough functional testing focused on the API layer... (Budget: ₹3000 - ₹5000 INR, Jobs: API Testing, Java, MongoDB, RESTful, Software Testing, Spring Boot, Test Automation, Test Plan Writing)