Halil İbrahim Kalkan is a computer engineer who loves building reusable libraries, creating distributed solutions, and working on software architectures. He is an expert on Domain Driven Design, Multi-Tenancy, Modularity and Microservice Architectures. Halil has been building software since 1997 (when he was 14) and working as a professional since 2007. He has a lot of articles and talks on software development. He is a very active open-source contributor and built many projects based on the web and Microsoft Technologies. Halil is currently leading the open-source ABP Framework, which provides a complete architectural solution and the necessary infrastructure to implement that architecture.