Hi Harshad, nice to see some new faces in our Mendix community. In my opinion showing a knowledge of basic database and programming principles should be enough, even though Mendix is more drag and drop kinda tool. It is awesome that you have something you created on your own, to show them that you are interested and willing to learn. Also, I've found these questions online if you want to get extra prepared https://mindmajix.com/mendix-interview-questions . Good luck and hope you get the job :)