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Updated weekly · Last refresh Oct 16Alcon Data Engineer Interview Questions
The questions to prepare for a Alcon Data Engineer interview. Questions from real interview reports rank first. Updated daily.
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SQL & Data ManipulationStart here. 1 question + 2 drills · ~35 min
SQL Email Null HandlingEasy
Practice
Calculate Alcon contact email coverage using COUNT, NULL handling, and a PostgreSQL CTE.
Data Analysissql
Alcon
AlconSQL Rolling Average WindowEasy
Practice
Practice drillCalculate monthly IRS return processing averages and three-month rolling averages with a window function.
Data Manipulation
IRSSSkan.ai
GrubMarket
IRSSSkan.aiGrubMarketUnique Elements and Top-K FrequenciesMedium
Practice
Practice drillReturn the first row for each unique value, then rank the k most frequent values.
large datasetsData Structurescomplex queries
Everlaw
Everlaw2
Coding1 question · ~15 min
Majority Element in ArrayHard
Assesses algorithmic problem solving for array frequency and edge cases.
Data StructuresAlgorithmsoopAlcon
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The finish line: interview-readyComplete all 2 questions plus 2 hands-on drills to finish this plan.