Charles Schwab Software Development Engineer In Test SDET interview questions

First round was a screening round with Recruiter on call nothing much just explain how you used polymorphism in your project and what project you did. Than next there was an in person interview 3 rounds back to back Round 1: Behavioral Round 2: was been taken by a senior Java developer because they wanted someone who is string in java. Round 3: How would you design framework for your project expalining e2e everything and followup questions