Developed Swagger-based API documentation for the SI-SecureRemoteControl/remote-control-gateway repository, focusing on establishing a clear and maintainable API contract. Leveraged Node.js and JavaScript to define the OpenAPI specification using Swagger JSDoc, incorporating server definitions and interactive documentation through Swagger UI. This approach enabled faster developer onboarding and improved API discoverability, allowing both clients and internal teams to explore endpoints and integrate more efficiently. The documentation workflow was structured to support ongoing maintainability, reducing integration time and enhancing reliability. The work concentrated on backend development and API documentation, delivering a single feature that addressed integration and maintainability challenges for the project.