Google

First, I received a telephone interview round, where I was rejected due to a backlog. This was quite surprising because I thought the founder of Google was a college dropout.

Basic introduction about my projects and skills. Then, they gave me a coding question. I couldn't solve it. The questions were about Graphs, Dynamic Programming, and Backtracking.

SQL & Data Modeling Writing non-trivial SQL queries Designing schemas for analytical workloads Normalization vs denormalization Partitioning, clustering, indexing Coding & Algorithms Implementing basic data transformations using Python or Java Man