The tech sector is a big place. There are countless people who haven't programmed anything in their life and are successful. Assuming you mean in a programming role... I wasn't a CS major and am successful. Continuing education is a necessity, and I'm always going back and learning things I may have missed not having been a CS major. That being said, "CS" aren't magical letters that open doors to the golden kingdom. I know plenty of dumb-as-rocks CS majors. Most success tends to boil down to the human element.
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The tech sector is a big place. There are countless people who haven't programmed anything in their life and are successful. Assuming you mean in a programming role... I wasn't a CS major and am successful. Continuing education is a necessity, and I'm always going back and learning things I may have missed not having been a CS major. That being said, "CS" aren't magical letters that open doors to the golden kingdom. I know plenty of dumb-as-rocks CS majors. Most success tends to boil down to the human element.