Received a call from a recruiter, and the first interview was scheduled. The first and second rounds are technical in nature.

1st Round: This was focused on project details and Scala programming. Every answer was followed by an in-depth discussion. One coding problem was presented.

2nd Round: This was a Spark technical interview. Two practical questions were asked: one where you needed to identify where the code would run (driver/executor) on an RDD, and the second was a DataFrame problem. The focus was less on theory and more on practical application.

3rd Round: This was with a manager. The content of this interview depends on who conducts it. Be confident and clearly explain your role in your current project/company. Be prepared to explain why you want to join BlackRock. They might also ask some puzzle questions.

1st Round

Q1: What is currying? Q2: What are partial functions? Q3: Difference between AnyVal and AnyRef? Q4: Case Classes in-depth discussion? Q5: Given an array of integers, return the indices of two numbers which equal the target. Q6: Why Parquet?

Questions around my current project.

2nd Round

RDD practical problem where I needed to get the output of RDD operation. DF practical problem. ReduceByKey vs GroupByKey. Optimization techniques. What is data skew and why care about it?