本人金融工程背景，有4年四大M&A咨询经验，处在promotion year并且公司正在办绿卡，但是因目前做的东西市场偏小，还考虑到如果继续做2年后拿到I140跳槽选择面会很窄，所以决心在绿卡开始办的时候跳槽。下面是朋友内推后拿到第一个Visa data scientist电面的面经：面试官是一个Visa的data scientist，不是Manage
He introduced himself and the team
He asked me to introduce myself (I was cut off after 5 mins and finished talking about one rotation project) 这里总结一下自我介绍不能太长，因为我一开始以为这第一面是想要了解我做过的东西，但是其实面试官要留10分钟左右时间问SQL的题
Why do you want to switch jobs?
Why did you choose Visa?
Rate your SQL skills from 1-5
SQL Q1 – difference between Inner Join and Outer Join
SQL Q2 – There’'s a column of random numbers from 0 to 100, one number can have multiple rows, how to categorize each number such that 0-25 = A, 25-50 = B, etc.
SQL Q3 – How do you find the 25th , median, 75th percentile, etc.
SQL Q4 – How to find median without using median function
10/12面试，11/2收到二面的通知，Schedule了这周四（11/8）二面，Recruiter说如果二面通过会在11/16 on site。大概就是这样，希望对大家有用。另外欢迎有Visa家经验的朋友交流二面的经验！