First round- Find missing number in an array(given the range of numbers). Implement parseInt function.(parseInt is in Java). write regular expression to find date in a given string(in python). Different layers in OSI model and their functions. Explain LRU (It's a page replacement algorithm). why do we study compiler design. Questions related to sql(joins, update one table based on the values of other table, indexes,etc). Second round- Brief description of project and which Machine learning algorithms I used (Explain) and various puzzles (finding area under curve, probability questions,etc)