Geisinger Data Engineer Associate | PA
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Hour-Long Technical Interview

Python Questions:

Reverse Substring in String (without using slices):
I was tasked with reversing a substring within a given string without employing slicing operations. This problem resembled the scenario described in this LeetCode problem.

Find Prime Numbers within a Range (O(n)):
The challenge was to devise an algorithm to identify prime numbers within a specified range with a linear time complexity of O(n).

ETL Description and Spark Script:
I was prompted to elucidate the Extract, Transform, Load (ETL) process and then compose a Spark script to perform ETL transformations.

SQL Questions:

Top 5 Salary After Joining 2 Tables:
The task involved querying to ascertain the top 5 salaries after merging data from two tables.

Employees and Projects Before 2024:
This query necessitated joining four tables to retrieve information about employees and projects initiated prior to the year 2024. Additionally, year extraction from a DateFormat column.

All coding tasks were conducted on Coderpad, where you needed to execute the scripts to showcase the results accurately.

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