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Data Engineer Interview Questions
21,051 data engineer interview questions shared by candidates
Dot Product with Sparse Vectors, Dot product of sparse vectors stored as hashmaps
How would you design and build a data model to report on active users and number of posts by interface (ipad, iphone, desktop web, etc) given a hierarchy of these interfaces and their rollup groupings, at any and all levels of the hierarchy?
Phone: SQL qs are pretty basic on equi joins, outer joins, and self joins. Coding exercises are pretty basic like word search, etc. Time is a crunch (1hr). You have to keep explaining while coding so that the interviewer online understands your thought process. In Person: Some live coding exercise, tougher than phone qs, product sense, visualization.
Design a relational database for a ride-sharing app.
(After being shown a graph with some data) Can you think of reasons why the data would appear this way?
Easy/medium SQL and coding
Add up a sum of numbers on a whiteboard and give me the average.
Didn't pass the tech screening. 60 min of SQL and Python (30 min and 3 tasks each). SQL is intermediate with given schema, Python rather foundational data structures and algorithms.
Python 1.given an ip address as an input string, validate it and return True/False 2.count the neighbors of each node in a graph. input graph is a multi dimensional list SQL 1. Display the most common name in the table 2. a case statement related question. pretty straightforward
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