I need a small, well-structured Ruby service that exposes intuitive REST endpoints (GET, POST, PUT, DELETE). The core of the project is data-processing: requests will arrive, pass through my routing layer, and must then be propagated to specific, user-defined groups before a response is returned. Key points you can rely on: • Language: Ruby is not mandatory, feel free to use Rails, Sinatra, Hanami or another lightweight framework as long as the final routes stay clean and conventional. • External calls: the service has to consume several third-party REST APIs; graceful error handling and time-outs are important. • User layer: the API must already include Authentication and authorization plus basic User profile management so that each account can create and manage its own groups. Deliverables I expect: 1. Source code in a Git repository with a concise README that covers setup, environment variables for external APIs, and sample curl commands. 2. A short test suite (RSpec or Minitest) proving the routing logic and successful hand-off to at least two mocked external APIs. Everything should be container-ready; if you normally work with Docker, include a simple Dockerfile and docker-compose.yml so I can spin it up quickly. Let me know if anything above needs clarification; otherwise, show me how you’d approach the architecture and I’ll green-light you to start.