I've done two technical interviews this summer. The first one was shakey, the second went really well, but ultimately both places moved on with another candidate. It's definitely a skill and learning to not get so nervous about them helps a ton. I went from grad school physics to my first data science job and I'm trying to further transition into ML engineer type roles. My biggest insecurity is not knowing the comp sci 101 basics, since my programming was self taught along the way (learning what I had to learn for my thesis research simulations and then whatever else I learned in my first 2.5 years as a data scientist). I long for the day that I have enough experience under my belt that I'm a ML unicorn and companies view me as highly desirable, but I probably got many more years of grinding til I reach that point.