Hi Nimesh, learning Data Structures and Algorithms (DSA) would not only assist you whilst you're on your job, it will massively affect your chances to ace the interviews at Big Tech firms i.e. FAANG etc.... As far as programming languages are concerned, it doesn't matter which language you're comfortable with as long as you're good at it. Having said that, its pretty common to use C++, JavaScript and Python during the interviews. Best of luck :)