The thesis aims to explore and implement two complementary approaches to integrating OpenAPI specifications within a microservice-oriented architecture. The focus is on the bidirectional relationship between API specifications and source code, as well as on evaluating how these approaches can be automated within modern CI/CD environments.

The theoretical part will introduce OpenAPI, discussing both specification-first and code-first approaches, and highlighting their advantages, limitations, and use cases. The thesis will also discuss the relevance of OpenAPI within microservice architectures and continuous delivery pipelines. Furthermore, discussing the state of the art of integration of OpenAPI specification in CI/CD pipelines. 

The practical part of the thesis will involve designing and configuring a continuous integration and delivery (CI/CD) pipeline that supports the automatic generation of OpenAPI specifications from deployed microservice code and the automatic generation of source code from OpenAPI specifications.

Each approach will be demonstrated on a dedicated demo microservice, illustrating the end-to-end workflow and automation process. The pipeline will further be extended to include API contract testing and automated validation of OpenAPI specifications, ensuring the consistency of API definitions across services.