What is SOLID Principle What are the design patterns? what are the most used two patterns by you, and what are their diagrams? Is Java Script multi-threaded and how it handles multi-threading. the difference between throw and throw x in handling exception. In Domain-Driven Design, what is aggregation, what are the index types in SQL server? what is CTE (Common Table Expression) and why use it? In .net core what is middleware? What is dependency injection and what is an inversion of control? IOC What is the grid system in bootstrap? How you leave equal spaces between divs using bootstrap? Some Angular Questions. Observables, must you subscribe and unsubscribe in observables? Cloud and DevOps: What is CI/CD - Continuous Integration and Continuous Delivery?